It still doesn't make too much sense to me though that the best player on the losing team ranks down, and yet the worst player on the winning team ranks up. Of course like any sport the team that wins advances, but the way rank is reflected, it reads like this person is really shitty at team slayer, when that could be far from the case.
The rank is personal rank. It reflects the person's skill level. So tell me, is basing it primarily off of rudimentary win/loss really a good indicator of the persons individual skill level for that playlist? What if he easily gets more kills than deaths, has tons of assists etc. He could easily be ranked much higher had he been backpacked with better players. It's somewhat equivalent to giving some guy a C+ in PE class because he got paired with benchwarmers and lost and yet he was easily the best player out there.
Maybe they can make it where you lose far less than if you were actually bad, because for some matches, I probably lost more progression for a loss where I easily outclassed other players, than I would gain if I won.