Borderlands (1 and 2), Left 4 Dead (1 and 2), any Half Life Multiplayer game, Titanfall, Dead Space 3 are my personal favorites. If you want a good coop game then yea Borderland or or ooo how did i forget Resident Evel 5 and 6. Well haven't played 6 but 5 is a really fun Co-Op. I've beaten that game so many times. Played it on Every Difficulity with CoOp and with AI. Have like every weapon, maxed out, unlimited ammo haha makes the game to easy.
But yea there are a lot out there!