Personally, I don't care much for "Powers"
Biotics are fine, but it seems kind of "Force-ish" to me, and the recharge time....not a big fan of recharge time.
Tech, not so much, my brother was an Engineer in the first and second ME, and I have to say, I noticed his deaths were more "by lack of survivability" than "On Purpose" *COUGHCOUGHCLOSERANGECAINCOUGHCOUGH* where as I was more "On Purpose" for lols.
Oh, and seeing as how more than two team members can use Tech powers, it isn't very reasonable, other than for your own amusement, to add a third drone into a middle of a battlefield.
so, as you can probably tell, I liked the Soldier Class, being able to slow down time to a crawl and fire off any gun I want before it wears off, EVERY THREE SECONDS was actually kind of helpful. (plus irregulated voices was kind of funny too.)
And the Squad Ammo + Concussive Blast wasn't too bad either.
When I actually come around to a second playthough, I'll try a biotic, maybe Infiltrator or Vanguard.
Funny Story to tell: More often than not, my victims would fly to their doom or die in funny poses.