I agree 100% with babyknees - cheats used to run rampant in Counter-Strike, for example, and it made playing the game miserable for quite a long time. Everything from replacing the models with high-visibility ones to teleporting into the opposition's base at the start of a round. It all sucked. If you're only modifying your own experience, fine, but don't mess with mine. Lag and server-side problems are enough to deal with without cheaters/hackers screwing around with things too...