I have been stuck in my 1vs1 arena rating for weeks, as the MMV is absolute bullshit.
It does not matter how many matches I win, there will always be guys I don't have any chance because of their ILVL.
When their MMV is way above mine I only lose 1-3 points - but I also get confronted with overpowered people that are new to the arena and then my rating drops significantly.
It would help if you match arena 1on1 by ILVL instead of MMV or at least find an algorithm that reduces rating drops when the winner has a way better ILVL.