I've given up on stats...it's all about enjoying the game for me.
That's often why you'll see me running around with a pistol and nothing else...If I kill someone, I may steal their primary weapon, but it's very rare that I feel the need to do so.
Being overly competitive and feeling the need to stat-whore just tends to ruin the fun imo. Like CT's that hide in T Spawn after the bomb's planted b/c they're outnumbered 5 to 1 and don't want another death to ruin their precious k/d ratio. That suicidal rush is some of the most fun I have in game, and while I respect others tactics, I definitely don't agree with them.
If you want to be the best, earn it...don't do it by artificially inflating your K/D.