Counter-Strike can be somewhat crappy online...depends on if there are server ops in there all the time or not and if they are up-to-date with the latest anti-cheat software. They can run commands to examine their accuracy and if it's EXTREMELY high, then the player could be cheating and are thus followed in the game for any suspicious acts.
CS rocks when you play it at a big LAN party. If anyone cheats, you simply walk over to where they're sitting and beat the living crap out of them.

J/K Whenever someone cheats at my LAN parties, I simply send their arse home and are never invited over to play. Period.
This particular game definitely goes down in the record books, along with StarCraft, Solitaire, and the many other great games that were produced. Truely, it's a one of a kind.
EDIT: Spelling!
