Battlefield 3's online multiplayer is somewhat of a travesty, considering how much some members of our staff play it. Neither of our main combatants have ever actually spotted a cheater (at least not in any verifiable way) while playing on Xbox 360, but the game's developer is nonetheless tracking down these nefarious rogues, issuing stat resets and outright bans to offending players across 360, PS3, and PC. The Stockholm, Sweden-based devs at EA DICE "recently banned another batch of several hundred confirmed cheaters," and are only stepping up their efforts all the more as time goes on.
The first measure in this initiative will be an addition to Battlelog, one which allows players to report offenders via their online profiles, regardless of what platform they're playing on. With any luck, between the community and DICE, the contingent trying to ruin everyone's online experience will be stomped out quickly.