Posting here for suggestions on any co-op games. Co-op as in teamplay. With Steam's summer sale, I'm looking for new stuff to play. We're a group of 4 and that usually matches the "max co-op players" limit.

We've played (and general consensus)
Borderlands 1 and 2 (very fun)
Left 4 Dead 1 and 2 (meh)
Alien Swarm (Hard)
Terraria (Fun)
Castle Crashers (Fun)
Dead Island (We couldn't get into it)
We play Minecraft once in a while too.

Just got Defiance and tried it myself today. The game is... eh. Needs some PC adjustments, like aim mouse sensitivity. Also thought about getting God Mode by Atlus. Looks fun for a bit and had a flash sale for $15 for the 4-pack.