Toe Tag.
I know a player who used to play Dust and Dust 2 exclusively. He never had a K/D ratio much higher than 0.8 or so but was always one of the highest ranked players.
The reason for this was "objective" completion. You gain 10 bonus points for "planting" the bomb and a further bonus for it "exploding". You also get bonus points for defusing the bomb. He was VERY GOOD and completing the objectives instead of worrying about K/D ratios.
