Elaborate on the cheaters part please.
Happens on PC all the time. Guy gets a killcam and in his kil cam (generally due to lag or the game or whatever) it looks different than what he believes it should and accuses you of cheating, reports you, etc.
In most games the kill cam only records part of what happened at that last moment, for example in Black Ops things like smoke, flashbangs, etc. that were present during the actual kill don't get recorded and they just replay the action as it would appear on the board at the second it replays.
Generally I either know where I got killed from, or applaud the guy for having good position, killcams seem to add unneeded stress to the situation.
Now, being able to go back and watch a video of the game afterwords is a much better tool for determining if you were cheated, but also to learn what mistakes you made.