i don't really care if they keep track of it or not. i play a game for THE GAME, not to see how well/svcky i do lol.
i however did like in bad company 2 how getting so many kills with a gun would give you medals and xp and such. i got like 500 kills w/ a shotgun
i wouldn't mind the game keeping track of the amount of kills you got, but RATIOS, eh. w/e