I swear guys, the M-6 Carnifex heavy pistol with a damage boost and scope, is one of the best guns in the game for someone that likes power usage with high accuracy. In bronze and silver I can pop soldiers heads left and right without having to go through the long reload process of the sniper rifle.
I hope I unlock it quickly once the actual game is released, same with the Turien Sentinel, as he has become my favorite class.
Tech Armor? 40% damage reduction, yes please. The downside is slower power recharge, but that's why I just take the Carnifex, it makes up for any recharge rate I lost from the armor and then some. It makes it much easier to stand in the line of fire to line up my shots.
Warp? Great for weakening up soldiers or stunning them the second I need to pop them in the head. Works around corners too.
Overload? Bye bye enemy shields and barriers. So much for the one thing that was actually defending those guys heads from my pistol. Can stun lesser troops too.
If I had to choose another class, I really like the Engineer and Adept. I am strangely not all the impressed with the Soldier, which is odd considering that is the class I played for pretty much all of the ME series single player. Krogan Soldier is pretty insane though if you like melee.