Something that EVERYONE can agree on.
KILLS SHOULD BE BY DAMAGE, NOT THE LAST HIT!
You get your first kill as a zombie and right when your about to hit...a fucking headcrab comes along and kills the human, thus that person 1, and you 0.
OR
You empty your last clip in hoping to get a new weapon upgrade onto a zombie, but right as you have 1 bullet left...some goes boom! headshot with a usp and they get teh kill.