Never cared too much about kdr, or any of the stats really aside from my streaks, when the controller's just being passed around to whoever happens to be here, it's easier not to.
More fun at times too, you can get alot of action just suicide-rushing the objectives.
You'll have some good games and some bad games, they're just games though, no need to stress out over numbers which could've easily just been boosted/modded (depending on system).
Really doesn't prove much in the end, all that matters is how well you perform in the game you're currently doing, even then it's fun to just fuck around a bit from time to time.