I dont know, I just started replaying after a siesta and i started grinding the lines that were still open to me. I skipped T1-3 and T4 was sorry but just not fun with all the CVs, yeah yeah I know, they were before in the game but not so potent.
What I saw on T5 and T6 a lot of times is on one side all players except 2 that participated in ranked play and on other side just 2, I can off course accept that you can take participating to ranked games not really into a factor for MM otherwise people maybe not want to join ranked but still odd that you have this 'randomness'.
And if i may say, another thing that does not make sense is MM not taking divisions into account, ok ok I agree there are always idiot division rather wanna see if 2 or 3 BBs can actually mate with each other at the border of the map, but mostly being in a division IS a factor.
Seeing then everybody on one side except 2 in a division and your own side just 2 in a div the rest solo well forget about vaseline boys its gonna hurt...
On higher tiers it feels more ok and better balanced and I dont have the same issues there...
I played years of WOT and yeah MM is a thing people are always talking about mostly because well they suck (yes prob like me), but MM is such a big factor in a game like wows, and for me on mid tiers something is not ok. (and to clarify i am not talking about tier diff, thats part of the game...)