Construct Your Ideal Class

Cool idea!

First, let me establish a baseline. My favorite spec of the whole series was the ME3 Soldier. The Soldier gets the most out of the cover-based shooter mechanics, and since I really enjoy cover-based shooters, plain old Soldier was perfect. But I kind of missed not being able to use any biotic powers. I didn't like the dual-spec options in ME, Vanguard and Infiltrator, because they (necessarily, for balance) compromised the Soldier abilities.

That's why I love what they did with ME3 by adding a bonus "superpower". I took Flare and had the most fun in combat of any of the games in the trilogy.

I think it would be great to generalize the superpower mechanic and allow any spec to pick one active power from one of the other skill trees as a superpower.

So if you want to be a full Adept but also really want to use Warp Ammo for sniper one-shot kills, go ahead! Or if you're an Engineer and really want to sneak around to set up drones, take the Tactical Cloak from Infiltrator.

You only get the one bonus power, though. Maybe there is a mechanism for swapping it later, ala Tactician's Amulet.

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Okay, now the class. It's basically just a mash-up of all the best run-and-gun powers from ME3. I'm not sure what to call it. Rambo, maybe?

Adrenaline Rush
Concussive Shot
Fitness
Combat Mastery
Smart Ammo (toggle between Cryo, Incendiary or Warp)
Grapple (non-biotic version of Pull)
Roar (non-tech version of Overload)
Cyclone of Death (non-biotic version of Shockwave, only it's AoE is a full circle, albeit only to 3 meters)

Superpowers: your choice of any active power from any skill tree!

Annihilation Vanguard - This is something I've wanted since the N7 Fury came to multiplayer. Annihilation Field active with Biotic Charge and Nova, how awesome would that be. Biotic Explosions for days. Anyway, here's the class build:

Biotic Charge
Nova
Annihilation Field
Pull
Bonus Power - Dark Channel
Incendiary Ammo
Fitness
Assault Mastery

Based off of ME3's power set

Marksman
Arc Grenades
Overload
Incendiary Ammo
Defense Matrix
Turian Ghost Tac-cloak
Turian Soldier Passives
lolfitness

I can take over all of Andromeda vs an unlimited army of anything.

5 powers for ideal class? Pffff ROFL STOMP Vanguard:
Nova, charge, win.

I'm pretty fine with ME3's version of the Engineer which is my fav...but one addition I'd make is my omnitool heavy melee strike would fire an arc of electricity to send my foe into convulsions which I could follow up with rifle butt to the face with my light melee...

Keeping it simple.

Sentinel:
Tech Armor
Combat Drone
Inferno Grenade
Lash
Stasis

I would love a class built around the Omni-bow with different bow types powers (armor piercing,concussive).
Some tech powers like Overload and tech armor to integrate the build.

Something like this would really be nice.

I love the Fury. She's easily one of my favorites in MP and would dig having some of her powers in the SP campaign, particularly annihilation field.  

The current vanilla infiltrator is absolute garbage - it needs completely re-working imo.

Improved Infiltrator class:
(I'd like to see something similar to this, heavily Salarian/Geth inspired taking what works best from ME3:MP imo)

Tactical Cloak
Energy Drain
Proximity Mine
Phasic Ammo
Decoy
Recon Mine (Grenade-based)
Operational Mastery
Fitness

One where all the abilities are Passive/Sustained.