I met with the 1st and the worst cheater two times, he was a nightmare to my Kill-Death ratio. That cheater is : Jac70
He was most likely using the aimbot like hack and making headshots with a single bullet of a pistol, and even sniper rifle.
I saw his profile, he had normal kill to death ratio(Maybe, he started cheating a few months ago).
Another proof of cheating: He was using the stealth kill hack which automatically kills all the opponents of him. when being his teammate, I barely get a single kill, or two in a whole match.
Apologies, if there's already a topic on him. If this is to be closed, pls post me the link of existing topic first.