Too true bro, what's your fav offline Co-Op? Mine is the Co-op from the spinter cell series. Haha I don't even remember how many missions we had to restart due to being retarded and singing our own spy theme music while we were "stealthy"
I don't really have a favorite as I never played CoOp that much because most of my games are RPG (its my favorite genre). So all my CoOp playing was with friends who liked FPS.