What's up with playlist ranks?

Just finished my tenth game of SWAT and got a gold rank. My stats during the ten games? 2 wins, 8 losses. Average of 5 kills, 17 deaths per game (yes, I know, that’s awful). So here’s the question: How did I get out into Gold!? That seems too high. Based on everything I’ve read rankings are based on win/loss and possibly your play in the ranking games. I was awful.