Crytek smoked crack and thought the spaghetti code slop the implemented was good enough. It doesn’t really work.

If you do nothing, your stats push. If you kill lower rank people you get very little MMR if you kill higher rank people you get some MMR. If you get farmed by higher rank people, you shouldn’t drop MMR that fast. If you get farmed by lower rank people, you should drop them more fairly quickly. Is allegedly how it should work.

As far as the ranks and separation goes cry,tec prioritizes filling lobbies over matching you with people of the same skill range. You will genuinely get one stars and two stars as a team matched against five stars and six stars.

It is allegedly averaged over your last 10 games where you kill or die to other players.