Not true at all.

Rounds Won isn't a good aspect, it could just means you're team stacking. On the other hand, you may lose a lot, but the reality of the situation was that you were helping the losing team out, and it's too much for you to overcome.

Score/Points represents your time&dedication to the server.
KDR represents how well you can do in a pub.
Headshot% is important because it helps you get better and becoming quicker at target acquisition. It also gives you information of how/where you're shooting and what you may need to do to change it.