I use to care a lot about my K/D, when Black Ops 2 came out I was getting really angry going negative every game so now I just laugh every time I die, it helps a little. As for objective I'd say that I am an objective player now, I never use to be but considering the game rewards players who play objectively I have changed my play style. :p
I get around 25 Confirms on Kill Confirmed while my friends and team mates get about 2 or 3..