i agree with the post by snipedown. I also want to point out that if players dont care about a win in a tough match and decide to coast to keep their high mmr then you are never gonna get an accurate representation of someones actual skill if theyre not playing the game properly. Essentially, its making matchmakings job harder especially since theres only one global mmr i believe . there should be a separate mmr for each mode since people play better or worse on different types of modes for whatever reason.
If a player knows hes going to rank down the same as everyone else regardless of his performance then theyre gonna always go for the win which will give an more acccurate representation of skill and improve matcchmaking.
Still not perfect though since people have diffferent playstyles that are effective to their team and their mmr may seem better or worse than their actual importance to the team. Thats the side effect of a strong teamplay game and why team chemistry should be a bigger focus to measure than just individual skill going forward in the ranks systems future. I think if a rank system could measure chemistry better, it could even speed up search times. For example, measure how much people move, people who move more are more agrressive and are probably better teamplayers. measure how often people use the spotting mechanic, how often they get team kills etc. if matchmaking has mmrs that are not quite matched then have systems in place that can also measure chemistry to make a better match.