As mentioned above, Player vs Player online is full of cheaters in any game, this is why I only play coop in GRAW2.
If our admins catch anyone cheating we ban them.
We at =GSA= host COD4 and GRAW2, and I must say much more cheating happens in COD so I simply enabled kick voting and the guys sort out the cheaters, otherwise policing becomes a full time job. So yeah, coop FTW !
=GSA=BrettP