I remember playing Q3 alot with aimbotters, and still getting the best of them
AFAIK, there have been no reported instances of aimbotters in AA, though the occasional speed hacker shows up.
The most important thing are vote-kicks. This way an Admin doesn't have to look after all played matches. If enough people vote to kick somebody this has the same effect as an Admin issuing a kick. Allows players to regulate the matches themselves. Obviously needs a majority of people voting for a kick but that's usually the case if somebody really annoys the fuck out of everybody.
@Dragonlord: or it allows a few pissed-off players to kick a legitimate player they don't like..
Nope, as I said, you need a qualified majority ( meaning 66% of votes or 75% of votes ). So if you have already 10 people playing it needs 6 or 7 yes votes to trigger a kick.