User blog comment:Crazy sam10/Double weapon XP 2-5 August Black Ops II/@comment-93.78.5.124-20130730003932/@comment-3967954-20130730170715

It ranks you on how much you play, not how well you do. If you don't play for even a few days, it deranks you by several ranks. If you play for days on end, regardless of how well you do, you'll get ranked up.