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Resident Evil 5 is cool to play with someone

Portal is great, with added custom chambers you can play it for so long. I remember me and a friend had a three hour marathon on the same map but we got it in the end :)

“Big” games: Borderlands 1/2, RE 6/Revelations (dunno why so much hate), L4D2
Indi: Monaco, Shoot Many Robots

Monaco is indeed pretty fun, but gets boring after a while because it basically just repeats itself while it gets a bit harder. Stopped playing it after a bunch of levels.

Splinter Cell: Chaos Theory is quite good, but 2 players max.
Furthermore you might want to try Doom 3 Coop mod or HL2 Coop mod, especially if you have not played it in singleplayer yet.

Additionally, I recommend Killing Floor.

As someone mentioned, the Portal 2 co-op is worthwhile and there’s some decent custom ones in the workshop.

Trine 2 was really nice. It’s beautiful, and not overly intense (puzzle-based).

Orcs Must Die! 2 is another great co-op game and i’m pretty sure there will be a nice sale on that. I think you could enjoy that with almost anyone and is fun single player anyway.

Magicka is maybe another that might be of interest and will be cheapo too.

Yeah, Dungeon Def. has co-op (up to 4 people iirc?)

Are there any good side-scrolling (like Battletoads or Turtles 2) or 3rd person (like God of War, Darksiders) co-op games where you beat up random shit?

If anyone wants to play Trine or Dungeon Defenders let me know!