Alpha Protocol can be played as a stealth game. It isn't as deep as say, some of the older splintercell games, but Hell it is still so much fun to full clear levels, sneaking around, stealthing up behind people, punching them in the throat, to doing a 360 pistol move to tranquilize anyone who may have seen you with a silenced pistol.
I almost didn't buy it at 2 bucks because everyone was bagging on it, but I got it and fuck the haters straight up the poop chute with a rusty chainsaw.