Good co-op games advice?

Looking for some good Co-op games I can play w/ a friend. Already have RE5 and Borderlands any other nice co-op games?

Marvel ultimate alliance?

R6V1&2, RFROM and R2(online splitscreen have offline also but hard to play),Warhawk(online splitscreen), MUA2, Army of 2, LBP, MW2, COD WAW, Lego Games, Sports games, GRAW2, Sacred 2 fallen angel, and music games.

Uncharted 2 have a 3 players coop mode, it's very fun.

The best co-op mode out now is modern warfare 2's Spec Ops, it's incredibility fun.

Saints Row 2 you can make your own character and play the whole story mode together.