Basic Classes in Terms of Difficulty?

Assuming a completely new player on bronze, with a completely new account, I'd say

Infiltrator > Vanguard > Adept > Sentinel > Engineer > Soldier

IMO the best beginner's kit is the Human Sentinel.

It has tech armor so you don't die fast.
It has warp, the most powerful debuff in this game, and throw, a tool to get rid of the most annoying motherfxxkers.
Combine the two and you'll get one of the strongest and easiest biotic explosions.
And it still needs you to do some weapon work.

Basically you can practice everything you need to on him/her.
And once you can treat yourself with an acolyte, believe me, you will be happy all day around, 

I love the Engineer class but in mp it's really boring IMO. When I play it in the single player it's completely different with a lot more skills, it makes it more fun. So in mp I mostly play Human Adept or Asari characters, the Valkyrie in particular but generally Asari characters are usually to my liking and very strong if specced right. Female Quarian infiltrator is alright too but I find her to die too quickly and it's like she gets injured by the slightest hit, which is a shame cause otherwise I like playing as her.

The HEng is the tech equivalent of the HSent, I think. HSent: all about the biosplosions; HEng: all about the firesplosions.

For the QFI, it goes against the prevailing opinion around these parts, but I think there's no shame in speccing full fitness if you prefer your characters that way. 
Here's my current build, I find her fun to play and very survivable.

Oh I wasn't talking about soloing, it's simply when I play with others in general

Thank you so much for this build, I can definitely use it

I feel this early, using a power class will be the best way for you to contribute to the match; most entry-level guns are pretty underwhelming, and the Mantis can be pretty unforgiving for new players, due to its single-shot clip. As you gain weapons, mods and amps for your guns, the Infiltrators and Soldiers become a lot more viable.

As such, my recommendations would be as follow:

1. Engineer: squishy, but the drone provides distraction, and overload is a wonderful power: it is hitscan, meaning that enemies cannot dodge it: if you cast it at something in your reticule, it will affect it. Overload-shoot mooks, overload-incinerate for a tech burst, then another overoad for a fire detonation against bigger targets. The geth love the drone, so make sure it is always out in front of the most dangerous units against them.

2. Sentinel: really sturdy thanks to tech armor, and early on a well specced throw can supplant your guns in taking down mooks, therefore mitigating the low damage of common weapons. Warp-throw biotic explosions are great against bosses, or groups of enemies.

3. Adept: great mix of crowd control and damage, but both priming powers (singularity and warp) can be dodged, so it's relatively easy to get in trouble. Speccing singularity for detonation on rank 6 allows you to get 2 biotic explosions by using only 3 powers: singularity to prime, shockwave to detonate, then warp to prime, singularity explodes and detonates. A really powerful cycle.

4. Infiltrator: tactical cloak is great at keeping you alive, but until you get better guns and/or get better at headshotting, you might end up feeling like you are not contributing much to the match. Both the Quarian Female Infiltrator and the Salarian Infiltrator have great staggering powers that help enormously with getting headshots, and are a lot more beginner friendly kits IMO. Once you do get one of them, equipping the Mantis might be the best build to begin trying silver out

5. Soldier: another weapon-based class that might feel a bit underwhelming at first due to meh weapons. However, a properly specced cryo build soldier (spec conc shot for shatter and shredder, equip cryo ammo and spam conc shot at frozen/chilled targets) can make great use of the Avenger, so you could try that!

6. Vanguard: I feel this is the class the most requires situational awareness and map knowledge to really shine. Once you begin feeling comfortable with the mechanics and the flow of the game, it becomes really powerful thanks to its shield-recharge-on-charge mechanic, but it still relies on constant movement and awareness of where your next threat/target is, and can be a bit overwhelming early on.


I hope this will be helpful there are many ways to skin a reaper, I hope you will find those that fit your playstyle best!

You put your finger on the thing right away!
The trick is that tactical cloak does not fight with other power's cooldown, it wraps other powers in it's own cooldown, you get 2 for 1 (1 for 2).
TC cooldown starts when you break cloak and ME3 TC allows power use while cloaked. When you cast from cloak whatever cooldown your power would have had, the TC cooldown replaces that with it's own (barring TC evolution 6A).
Additionally, TC damage bonuses are active for almost 2 seconds after breaking cloak, so you can use a power and shoot both.
And there is even more, TC cooldown is proportional to the length of time the cloak was active, if you brake cloak immediately after cloaking the cooldown is always as short as it would be with 200% weight bonus, regardless of your actual load. You get the listed TC cooldown only if you use the full length of the cloak. TC allows you to carry the heaviest weapons and still be able to cast powers.
Did I mention that powers also receive the TC damage bonuses?

The routine for the human infiltrator is that (assuming a semi-auto sniper rifle here)

A) you spot your target, it's not moving or you are confident you can hit:
1 cloak
2 shoot
3 cryoblast
4 shoot
do it right and 2,3,4 can all benefit the TC damage bonus, 4 also from the cryoblast debuff

B ) you spot your target it's moving, mook type
1 cloak
2 cryoblast
3 shoot
here cryoblast staggers the mook and allows you to line up your shot

You can add a sticky or two before decloaking, grenades do not break cloak.

I see the Vanilla Human Soldier at the bottom of a lot of people's lists.

Granted domi (is your username tied to #28?) doesn't have a more complete manifest, the Vanilla Human Solder is one of the strongest kits in the game - just need a Claymore and some incendiary ammo and off ya go.

What's number 28? If you are talking leaderboards, absolutely not & never will be. Domi is just my gaming handle of many years.

Concussive shot soldier was one of my go-to kits in my Bronze & Silver days.
In fact when I was pulled into my very first Plat match, I loaded up my HSol with Inc ammo ADAS I (or II) and did OK.

I sense a joke here somewhere