how to search for games with multiplayer and/or co-op options...

Sorry there is no specific search criteria for that. However, that would be a good thing to suggest. Why not add that to the feedback forums?

http://xbox.uservoice.com/

- My Greatest Co-op Game List:-

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Red Dead Redemption (Multiplayer Online)

Left 4 Dead 2 (Campaign Co-op, Survival Co-op with Multiplayer Versus and other modes)

Left 4 Dead (Campaign Co-op, Survival Co-op with Multiplayer Versus)

Dead Rising 2 (Campaign Co-op modes, alongside with Multiplayer Competitive)

Halo Wars (Campaign Co-op and Multiplayer Competitive)

Gears of War 3 (Campaign Co-op, Horde co-op and Multiplayer Competitive)

Gerars of War 2 (Campaign co-op, Horde co-op and Multiplayer Competitive)

Gears of War 1 (Campaign Co-op and Multiplayer Competitive)

Dead Island (Campaign Co-op and Survival Co-op)

The Co-Optimus Prime website is a pretty good resource for info about co-op games. You can search for games by system and look for what they call "couch co-op" which is local multiplayer:

www.co-optimus.com/.../xbox.html

I still think that co-op campaign should work as long as it is a multiplayer option for the game. I just can not tell you how long it takes to raise your rep this way.

Does anyone know how the co-op will work? Will it for once have drop in/out co-op? The biggest mistake with that particular aspect in all of their games is you can't freaking join random people's games. You can only play it if you know people who want
to play it. Most of my friends play through it once then only play multiplayer. In every game I've played that has a random host/join co-op option, I've played the *** out of it. Every other game that has co-op gameplay, has that option. It's time they
get smart about it and add more replay value to their games.