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also kane and lynch has two player campaign which is really fun. there is also the Fear 3 game which isnt really horror but is really fun. it has two player campaign where one person controls a character with devil powers and stuff and the other guy has like guns and grenades and all that. there is also like survival mode which is kind of like national socialist zombies.
I highly recommend FEAR 3. My brother and i had a blast playing it. The survival is indeed challenging and fun.
Any of the LBP games are great. LBP2 is the best one. I play it a lot.
Any of the Worms games are fun with friends.
COD multiplayer is good fun.
UT3 with a pal is a good way to test who's the bigger man.
Killzone 3 Co-op is a blast.
Rayman Origins is pretty fun with some friends.
Twisted Metal is always a really fun game to play.