Things you wish would've happened in the trilogy

I wish the asari would have taken more of a role in the galaxy and in the series itself.

From a lore standpoint it makes more sense than all the human focused stuff we got.

Well I am the type of guy that would let players to get/steal enemies gear and do research on them.  Well Yes the Collector gear will be reasonably spread out and just as powerful as their enemy counterparts. so their weapons are no less dangerous to them as they are to you. For example in Mordin's recruitment, you will be able to start collecting Collectors' weapons, gear and tech from the Vorcha. Then apply that Collector tech to your gear and weapons. So by End Game, you will have more than each superb end game weapons and gear due to collecting Collector, Reaper, Geth, Krogan and other technology and researching them and applying that Tech to your Gear.

I would be happy if Firewalker DLC in ME2 rewarded you with a Leviathan Orb, thus foreshadowing them, instead of that sphere that does nothing at all...

Where did it go anyway? We should've had the ME2 cabin items on ME3 cabin as well.

A batarian squadmate in ME3. Would be interesting putting him along Torfan/Mindoir Shepard, plus the Arrival DLC events and how you decide on that Batarian's patient fate on the Citadel.
So, maybe, make Balak the squadmate and remove the option of him being killed on BDtS, thus making his appearence in ME3 consistent

And Rupert Gardner! Come on, no one heard of that guy ever since ME2. Hope he joined the other waves of ships in the Andromeda Iniative.

Edit: Oh, and make the Normandy feel more alive in the whole trilogy, not just 3. It would add a whole new weight for the party in Citadel DLC where they meet up and end up talking what they didn't talk the whole ME2 game

Edit 2: And setting foot on the other species planets. Like Dekuuna, Palaven and Kahje(would be interesting seeing an underwater outpost, for example)
 And also hearing about Sidonis again. Saw once that he got cut, but was originally intended to help Garrus' family out of Palaven when it got attacked by the Reapers, and ended up dying in the process.

Difficulty comes in several forms including Increasing HP/Shields/Barriers, Tactics, Weapons Damage and Useful Abilities. Also Remember the line by Shepard that, "these husks look more advanced." despite them lacking Electric Attack ME1 Fame. I like the Electric Attack for the Husks due to it is a pain in the ass. I do think it is a good idea for Husk should use generic abilities that your team uses. More Variation of Reaper Husks within all 3 games. I do like Hopper Saren as well. More Nightmare fuel and Intense gameplay to make you hate and abhor the Reapers.

In addition to Jack's makeover, it might have been nice for some of the other returning ME2 characters to get new costumes. Given her fugitive status, it would have made sense for Miranda to have had a different look: new clothes, and perhaps dyed and/or restyled hair.

I wish ME1 had a more balanced gameplay: It was clearly in favor of pure classes rather than hybrids.

I wish I could see more of my choices reflected in ambient dialogue (similar to how Kasumi's loyalty mission had people talking.) Aetheyta told me once in ME2 that "sometimes, you hear good news, like those colonists on Feros being rescued.) If it's that newsworthy, let's hear more about it.

I wish the involvement on the salarians was more than just satellites for the krogan.

I wanted to see more elcor, volus, and hanar. I got too much krogan and too much asari, and I felt like they were just thrown in to explore what the dev staff "could" do, rather than it having a purpose.

I wanted Kirrahe to join my squad after Virmire (provided I saved him, of course). It felt natural, he was already there, y'know.

I wanted the Lair of the Shadow Broker to be about more than just Liara. ME2's selling point was about the team, a very character-driven story. That's good. So use it. Have other people talk: It would've been interesting to hear Miranda talk to that asari Spectre.

Speaking of the Shadow Broker, the yahg were a mistake. It was some big super-race who could do any and everything. That was lame. I think it would've been better if, instead, the Shadow Broker was a shadow Council, a triumvirate of a ruthless asari, a pragmatic salarian, and a stern turian. An epic, three-way boss battle (with a squaddie that isn't unconscious). After this, Liara sets up the Shadow Broker not as just herself, but working together with Sekat and Feron.

I wanted the Arrival DLC to have some focus on the Virmire Survivor. Kenson's mission should've been with them as your third. You could rescue them during the mission (or choose not to, they break out on their own). This mission would conclude ME2: You couldn't do it before the Suicide Mission, and you couldn't play afterwards. It would end with Shep dismissing the team on Omega, and then surrendering to the Alliance. If you rescue the Virmire Survivor during the mission, your relationship helps gets patched up somewhat. If not, they get a little steamed. This influences ME3. You also unlock a bonus skill for other playthroughs after beating this game: Kaidan offers Damping (which prevents enemies from using attacks like those Eclipse types using Incinerate, or the asari that use biotics. It also immediately kills combat drones), while Ashley grants Marksman (stabilizes fire, very useful for assault rifles and submachine guns both, so any class can benefit)

I wanted Liara to not be a squad member. She is a party member on Mars, but after that, she remains on the ship, but she uses the data feeds in order to monitor Reaper activity and coordinate, which takes up all of her time.

Kirrahe joins the squad after Sur'Kesh. He functions as a combat type with Cryo Ammo, but also provides Incinerate. Unique skills are Assassinate (similar to ME1 skill, increases damage for a time) and Arc Grenade (the Quarian Engineer multiplayer skill). These would unlock for Shepard like the other skills do.

Glyph's upgrades are much stronger (like 25% power damage for biotics), but they can only be assigned to one character and that's it. Each character can also only get one upgrade. You can re-spec for a cost at the med bay.

Reward me for keeping my ME2 squad alive by giving me bonus missions with them, even tie them into sidequests. Rescuing the elcor from Dekunna's moon was a missed opportunity, let me go there with Zaeed and give me an awesome rescue mission. Let's learn the depths of the Illusive Man's depravity by sending to a place only his trusted lieutenant Miranda would've known. Take me to a salarian colony world, let me get their egg clutches out of danger, and bring Samara with me, dammit, that's right up her alley.

If my relationship with A/K is high, don't let them say they might regret siding with Shep. Let them say something like "I get you, Shepard. Udina, you're under arrest." They believe me, let's hear it.

When Thessia falls because High Command wasn't telling me about it until it was too late, let me say that to the councilor. Don't let me mope around the Normandy like it's my fault.

Give EDI more dialogue about realizing what it means to be human. Change her body to be less of a sexbot and more like a beautiful, but proportioned, woman.

Let me criticize Liara when she throws her tantrum at Javik about the Protheans. Something like "No one knew what Protheans were supposed to be like. Stop being a baby. We've got survivors to deal with!"

Make the Citadel the Catalyst not because of Starbrat, but because it is the head of the relay network. The Crucible becomes a large pulse to overload the Reaper's circuitry: It just needs to travel through the mass relays so that they can all be hit: The Crucible is likely to be destroyed after one shot, so it needs to travel throughout the galaxy and hit all of the Reapers.

Divide the War Assets into five groups: Sword (air power, ships), Hammer (ground forces or tech for ground forces), Crucible (obvious), Commandos (unique individuals like your ME2 squaddies, or Wrex. Your squadmates do count towards this total) and C-DEF (that Asset after Udina's coup that can fluctuate a lot in size). Some forces overlap (like Mordin being both commando and Crucible), but most are singular.

If the Crucible assets aren't high enough, the Crucible doesn't work in the final mission. That's it, Game Over, you lose because you weren't prepared.

If Sword assets are low, the Crucible is destroyed before it's put in place. Also Game Over. If it is medium, then the Crucible is damaged, but can still fire. It will kill everyone in the galaxy, including the Reapers.

Hammer forces are determined by ground troops. If they are low, Shepard has to fight a lot more forces on Earth, so much that the game could become impossible. The higher the forces, the less troops need to be faced, and cutscenes are shown instead of your forces wiping out Reaper ground troops.

Your forward command post has all of your squaddies (plus any other folks who survived) there. Shepard gives a much more epic speech, splits them into groups, and they move forward.

After pushing through waves of Reaper forces, you make your way from Earth to the Citadel. Here, C-DEF comes into play. If the forces are high, there's a full blown firefight lead by Bailey, Aria, Kolyat, and other Citadel forces. If they are low, you're facing more foes, and those guys are dead. Along the way, you'll lose your commandos to different things (if C-DEF is high, it's because they need help. If it's low, they can be killed). By the time you reach the Heart of the Citadel, Shep is alone and badly wounded. Until he meets Anderson and TIM. Instead of babbling like a lunatic, TIM offers reasoned points as to why destroying the Reapers is a bad idea just because the other races are afraid of humans and might pounce after the war. TIM kills Anderson, you can either convince him to kill himself or shoot him.

After this, Shep, badly wounded, activates the Crucible and collapses, finally exhausted. Husks and ground forces come to him, but there's no way he can do it himself. If you don't have many commandos, they surrounded Shepard and kill him just as the Crucible fires. You're dead, but you saved the galaxy. If you kept enough commandos alive, your love interest (or most used squaddie) shoots the husks. They are killed as your friends surround you to defend your body. The Crucible fires, killing the Reapers and their ground forces.

If you had the right Crucible teams and geth specialists (siding with the geth, David Archer, Gavin Archer, Admiral Xen) and the like, they are able to tweak the Crucible so that synthetic intelligence based on Reaper code like them is slightly damaged, but not destroyed (EDI equates it to a war scar). If not, EDI and the geth are killed.


Anyway, sorry for length. That's how I wanted it to go.

MShenko in ME1; when going to the Citadel in ME2 for the first time, having the ability to turn in all the Cerberus people and take the SR2 for themselves (though probably not possible without an unshackled EDI); the Council *AND* Alliance weren't utter morons who stuck their heads in the sand about the Reapers; jumping; Kaidan/Ash trusting you in ME2.

The Citadel moved to Thessia instead of Earth

Really? Hybrids worked better for me than pure classes, at least vanguard + sentinel > soldier & adept (haven't played long enough with engineer to tell, and it's been ages since I played infiltrator--although infiltrator was pretty good iirc). To my surprise, I found my sentinel playthrough the easiest of all.

I wish I could have thrown Aria out the airlock.

I thought the War Assets made sense, I just thought they were pointless. Filler details to make Codex junkies happy, but completely unimportant to the game at large. Let's just see them in action, even if its a cutscene.