The soldier is so damn SOSO in insanity 
 
Adept is a bit better but god forbid you stick your head out for long 
 
sentinel is fine for the most part except not many big damage dealers 
 
vanguard played right is some fun stuff but if played wrong HELLO LOADING SCREEN. 
 
haven't tried enginner or infiltrator yet. 
 
INSANITY IS INSANITY for the most part but later on in the game its manageable I guess. 
 
CAN'T wait for ME3 and I think talis a stupid blotch and that legions my ROBOBRO and grunt is MR.TOAD.