LogFAQs > #982332278

Soldier can still be nice in ME 2 because really, nothing beats Assault Rifles, but weapon classes are available to every class again in ME 3, so you really lose out on a good reason to be Soldier in that game.

Infiltrator sniping is great, but it is really just sniping and debuffing enemies.

Vanguard 'should' be close combat, but as someone who played that on his first playthrough with just an SMG: play how you like. The class-based power, Charge, is probably the neatest of 'em all though.

Sentinel is nice to make OP, but you are stuck to just pistols in ME 2 for at least like, half the game, so that can be a drag (not that the pistols are bad it's just they are for sure the dullest weapon type).

Adept is fun because Singularity is just so OP.

Engineer is fun but needs a Sniper Rifle (which again dictates a wait in ME 2). I personally had a lot of fun though, sending out my combat drone, taking down enemy shields/armor/barrier and sniping away...but it's not for everyone.