Halo 2 has proven once again that you should never put any form of ranking or competitive stat tracking in the hands of uber dorks, they just don't deal well with competition. Counterstrike was the original and any server with great stat tracking/leaderboards was bound to be filled with cheating 13 (and 46, it seems to be the two ends of the spectrum) year olds.
Anyways, people have found a way using their cable modems standby button to lag up a game, long enough to grab the flag and get out of reach and then the game resumes as normal. Fortunately, it's very easy to see who is doing this because of the game viewer and bungie is workin on a fix and will probably ban people (thank god for this ability in XBL). Personally, I wish they would just castrate or kill these people.