My main character is now a Volus Adept. He can take care of all those annoying characters with his Stasis/Scorpion combo, has invincibility frames, Cloak, instant shields which make up for his poor defense, and makes every squad member twice as lethal by keeping their shields up 100% of the time.
Go pair him up with a melee Geth and watch the destruction.
I snipe with him. With his power balls spec'd for recharge, you can carry a pretty heavy rifle and just rock stuff with stasis/sniper shot. 6/6/6/6/0. Fitness doesn't matter anyway. Use Shield Booster V for gear and he's fine.
I ignore stasis because it doesn't works in anything worth and go for sphere recharge speed, shield boost with recharge and DR and max fitness.
I equip him with a reegar using either piercing or incendiary ammo and he eats both bosses and mook alike in seconds.
With max fitness you can equip him a cyclonic modulator and solo gold reapers without troubles, brutes die in two reegar clips, banshees in three, ravagers in one and anything else in a fraction of second. Banshee are a joke because the reegar will strip their barriers fast and go into shooty mode that you can ignore with shield boost.
Caoslayer, butchering english language since 6/9/2001