IMO, one shouldn't concern themselves with K/D, not for themselves or others. It places limits on this great sandbox game. As a high ping player, I never try to out shoot people. I always concentrated on sneaking into flag zones when I first started playing. That wins rounds and is very satisfying. I also like to hunt tanks with satchels or man the same AT gun for 30 mins, constantly repairing it. People should think about what they are contributing to the team goals. In a way I feel bad for the aces, rifle, plane, etc. There are much better games for their specialized skills. This game is great for people who are mediocre at everything.
Though there are cheaters who come and go, it is the campers who really kill the game for everyone. This is more of a problem on stock maps rather than the custom ones despite what is said above. The push code limits the routes and options and is the perfect set up for someone who has played for years sit in the right spot and rack up kills. Any camping problems on custom maps can be fixed in a few months if reported correctly.