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Saints Row The Third or IV are pretty good options, both support gamepads and the campaigns are fully playable in Co-Op. Issues may arise if one of the two PCs use AMD GPUs though.

You got a case of too much games and only play one or two hours on each before really getting into them. Try no more room in hell?

• Payday
• Saints Row 3/4
• Borderlands 1/2
• Beat Hazard
• Magicka
• Dead Island
• Portal 2
• Carstle Crashers

The ego-shooters not for gamepad but good coop-games

Portal 2 is an awesome game with hundreds of custom maps created by the community.

Payday 1 and 2. Great coop game. L4D with a good twist :)

Torchlight II. An nice Hack n Slay with a good coop mode.

Diablo 2:LoD and Diablo 3. D2 is the HnS masterpiece and D3:RoS a good followup. should be at least tried.

Borderlands 1 and 2. Grab an classic RPG and mix it with a bit of Steampunk and some FPS. Voilá you got an great Coop game with a breeze of fresh air.

In general i recommend http://www.co-optimus.com/system/4/pc.html for lookin for coop games. it is a great source of information.

Serious Sams

I am having fun with Contagion right now, I think any co-op or multiplayer game can be a lot of fun with the right people to play with :)
You could try Tower-Defence games.

Alien Swarm, Sniper Elite Series, Castle Crashers.

killing floor - Portal 2 - CSGO (mods/competetive) - Team fortress 2 - garrys mod // Minecraft

The good old gamepad not keyboard.

So far I have bought these for my friend (I already had all of them, except Ibb & Obb):

• Torchlight II (okay, this is the most addicting game ever, we already spent 6 hour playing it)
• Monaco: What's Yours Is Mine
• Payday: The Heist
• Ibb & Obb (great, small game, we have to finish this)
• Castle Crashers

We also play the following games:

• BattleBlock Theater

Any more recommendations?

You should play Killing Floor. It's the best game ever ;-)

Dungeon Defenders or Magicka.

Risk of Rain, any of the Serious Sam games, Trine 2... Terraria?

i really like dead island co-op

I'll recommend Killing Floor and Magicka, they're a ton of fun

Trine 2 + Portal 2 >> Best steam co-op games I have ever played.
Guild Wars 2 - best mmo to be played with friends. Incredibly fun, Level difference doesn't matter, Lots to do, extremaly fun to play with friends.

I notice you've got all the games from the Humble Co-op Weekly Bundle, maybe pick a game or two from there?