I'm got 3 at the moment.
A lvl 30 Infiltrator (Paragon)
A lvl 30 Adept (Renegade/Nuetral)
A lvl 3-5 Vanguard (Undecided)
So far, the Adept has been alot of fun. Plus it's my customized female version, so I'm more partial to her due to her uniqueness. Not to mention, the female seems to do a better job voice over wise in the renegade department.
what about you all?
So far I haven't been able to tolerate anything that's not Soldier. I just started trying to play as an Infiltrator and it's more like a chore than anything else. I'm also playing as the male character for the first time (6th playthrough) and I don't like him at all. I'm only doing it so I know what happens if you stay loyal to Ashley even don't I don't like her either (I also never played ME1).
Playing as anything other than Soldier deprives me of the assault rifle, which really sucks. The SMG is no where near as good. I hope hoping that the game would allow the Infiltrator to carry extra rounds for the pistol and the sniper rifle, but I was very sadly mistaken. I can't wait to playthrough again as another Soldier.
I played as Soldier and Adept in ME 1. In ME 2 I've played as Soldier, Adept and Infiltrator. Of the 3 classes I've played, I have to say I enjoyed the Adept class the most.
In fantasy RPGs I've always been fond of playing as a Mage. Preferably one with elemental spells. Adept is fairly close in play style as a mage. I loved setting things on fire in Mass Effect 2
I enjoy playing as most classes, but I'd say the Adept is my favourite. I love using biotics to hit enemies behind cover
At the moment, I'm doing my first Insanity run using a Soldier. I'm finding Adrenaline Rush incredibly useful at this point. I've never tried a Vanguard, but after watching the new combat footage for ME3, I have plans to use that class in my next playthrough.