It depends on the game. On Combat Arms, way too many noobs, so I had a 3 kdr. However, Mr.Unmentionable's Hacks came out and then it got trashed by telekill. Crossfire, about the same, I can manage 2.5 kdr. Modern Warfare wasn't that famous, only gaming addicts heard about it, so most of them are very pro; as good as Emnesty. I can manage a 1 kdr on it. Modern Warfare 2 has way too many ways to be abusive of some weapons, so if I use them, I can manage my way too a nuke(Noob Tubes and OMA perk to refill them is one ^^).
Hacking Combat Arms, I can get to a perfect 50ish kills or more(depending on when I joined the game) and no deaths with Catalyst aimbot.. Seriously, it's cheap and not patched after a few months.. Look it up on MPGH.
I don't hack MW2 because I'm not interested in getting banned. I hear they patch hacks in less than a day, and detect hacks in even less time. VAC delayed bans also are pretty scary.
Hacks are cheap. Most of the people here aren't noobs, just driven here because hackers have infested themselves on CA. On the otherhand, some people come here because they.. fail. Or are getting pwned by the Unmentionable, leading them to come here.
I quit CA. It's just getting out of control with abusive mods(Corndogs Knife and Kukri mods), Unmentionable, Catalyst, and AUG hacks, and the new NX weapons. Seriously.