Skill cant really be judged only on how much the given person have played but rather on how he/she played.
Also i know oldtimers who have a good K/D but would die in 1v1 in just a couple turns, yet others who die just as much as kill, they would still sweep the floor with me.
Many things can be numerized, but skill isnt amongst them. I would rather call it "effectiveness".
Eh, its just a matter of the eyepoint anyway. What do you call skill? Im just a d**k again, sorry.