I shouldnt be punished for having a top score. Except for the one that i pointed out in the warpath demo, i dont think i get any bullshit headshots. I certainly dont "aim at the ground" and get headshots like some of the posts here have claimed. I like warpath because there are extremely long hallways which are good for sniping. There are also lots of ledges and tunnels which are also good. I get headshots because i guess i am good enough to put a little dot on someones head and press mouse1. Its very easy to do when people are moving sideways, but harder for me to do when they are coming at me.
I guess i'd have to see more instances in those demos of me aiming at someones feet and getting a headshot, because that never happens and i never see it happen when i play.