What games are out there that are good coop/multiplayer?

My friend and I are looking for a new, quality PC game that is coop or multiplayer. We have already played Borderlands(felt it was too slow of a game), DOTA 2 (loved ALOT, but got bored after master every character), LoL(hated), l4d2(not enough to do), splinter cell: chaos theory(enjoyed), EYE, Kane and lynch(got bored after first level), Magicka (couldn't run) castle crashers (meh), Earth Defence Force (liked), Payday (couldn't run), Minecraft/terraria, Diablo 2, Day Z, Cry of Fear(enjoyed), TF2(felt they ruined it), SC2(we were bad at), serious sam(enjoyed) and WoW (enjoyed but didn't want to pay $15 a month). We have also played about all source games. He has a poor quality computer that can run about DOTA 2 at best. We're looking for cheap games(~40 dollars max) without monthly subscription payments.

Overall we're looking for a cheap co-op game that can run on low end computers.

one game we were looking at was SWAT 4 but had no idea where to get it

How to make Villagers Speak in Minecraft?

How do you make Villagers Speak in Minecraft?

How to make flat worlds start to generate like normal worlds in mcedit for mine craft?

Me and my friends have been working on a minecraft flat world in creative for almost a year now. I want to make it so that after a certain point, it starts to generate regular terrain, such as hills, mountains, oceans, snow areas, deserts, etc. How would i do this? Who ever answers the question best gets best answer.

Best budget pc i can get for 400$?

I'm able to get something for 400$ and i chose a pc but i'm having trouble finding a decent computer or trying to make one on pcpartpicker. All i want is a computer that can game decently, such as battlefield and minecraft

Intel i5 without graphics card minecraft?

Can a computer with intel i5 processor but without a graphics card run minecraft smoothly (45+ fps)?

PC games where I can build a house?

I want a pc game where I can build a house and stuff, like The Sims and Minecraft.

Best gaming laptop under 400?

Yeah, I know this has been asked before. And everyone says you can't get anything good for that cheap. But I don't want an actual gaming laptop. All I want to be able to play, is Skyrim, WOW, and Minecraft. I'm not a huge gaming person, but I play those games heavily. I don't know how much processing power you need for stuff like that. I also just want to be able to surf the web and do basic stuff. Suggestions would be great, or I just want to know how much processing power is needed.

What's a good desktop for gaming and cheap?

Well i'm lookings for a desktop for gaming like mainly for minecraft and around $300-$350 atleast around there with a good operating system

Minecraft-Can't grow giant mushrooms?

I wanna build a mushroom house in the air in creative but i just can't place down mushrooms! I know about the light level and I managed to place some in flower pots but bonemeal doesn't work and now I can't make them grow big!

Any recommendation for games?

So I've been looking for new games to play recently on PC. So far my favorites are Skyrim, Minecraft, Halo 4, WoW, DIablo 3, also i would prefer something on steam. I'll play FPS, RPG's and pretty much anything. Also no games like Amnesia.

Added (1). Oh yea forgot i've beaten dishonored and i have the beta for ESO already.