Disabling punkbuster would only encourage people to download hacks and "try them out".
Nothing good will come of it, even if they are legit on other servers, PB might ban them for having it on their PC..
(The cod2 community is small as it is, we dont need people getting banned aswell)
PS. do you REALLY need to cheat against zombies? is it THAT hard?
8.3 years ago