Practically all online games are riddled with hackers nowadays. I'm not going to buy any new online game again because of this. I'm not going to waste my money to the 'fun' of having someones aimbot headshoot me every time.
This is one reason I am not convinced Standalone for Dayz is going to be better, Arma II is just dead from hackers, but if the standalone doesn't get some kind of serious anti-cheat its just going to be plagued as well.