I've been a sucker for co-op games ever since Brute force for the Xbox (Who remembers that??? haha).
Just want to get a feel of other people's favorite co-op games of all time.
My favorite ones (in recent memory at least),
GTA 5
Borderlands (all of them)
Splinter cell (most of them at least)
Saint's row 2,3,4
Halo (all of them, except for the latest one. Really lackluster to me)