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I'm quite sure most players know this, but if you're on xbox 360 and play without cheats, you will get matched up with cheaters most of the time. Here's how to block them from joining your game and vice versa.
Step 1: Open the xbox guide
Step 2: Go to your recent players list
Step 3: Select the player that you wish to avoid
Step 4: Select "Submit Player Review"
Step 5: Select "Avoid this player" and then select any option (I usually select player skill -> Lacking skill) and you're done.
Enjoy, non-cheaters! 

   I suggested that system to avoid cheat players, as well, but there's actually a big problem with it.

   I can't speak for PSN, but on Xbox Live you can exhaust your available avoids quite quickly. I hit the

maximum number of avoids after doing this for only a few weeks. Even most Xbox Live staff do not know

there is a limit, and I spent two months in their troubleshooting qeue before someone finally found

the information.

   Needless to say, using that method dramatically affects your ability play multiplayer and co-op in other

games. Therefore, I actually recommend you don't use this method at great length. It will work for a

limited time, but after that, any "avoided players" added beyond the maximum will reset every time you

log in to Xbox Live.

   I have no suggestions as far as what to do, instead. In my case, I simply stopped playing Co-op.

-Jeremiah the 12th Level Geek