It's based on kill amount, not K/D which I think is R-tarded.

really? wtf.. no wonder i saw a kid with gold star but his k/d r hella bad lol its below 1.0 :/

This post was edited by DeafPwnisher on Sep 20 2010 08:43am

It is based on Kills+Assists and deaths. If your assist count is really high, it helps your rating a lot. They did that to encourage team play

Assist system is broken, and deaths means almost nothing
You could go -5 but have 12 kills and 5 assists and have a rating of 1500+

rank system's weak, and vanilla ftw indeed.