Keep in mind that playstyle heavily effects kd
Shotguns and run and gunners usually have the worst (for the majority, there are that few that succeed) and snipers and campers usually have the best of it (not including rush sniping).
The only real way to test someone's skill is doing it yourself.
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Ssssshhh you'll confuse OP. I agree if you camp - you're likely to inflate. Heck if I camped I would do a damn sight better on the K/D front.