Matchmaking
I don't know why they didn't do a bracket system in the MM. For example. Bracket 1: Tiers 1-3 Bracket 2: Tiers 4-6. (it's just an example it can be smaller like 1-2, 3-5 etc..)
After you reach the top of the bracket you go to the next one, so it will be enjoyable for everyone and more fair, not as random like now where you can be the lowest tier till you reach the top tiers (9-10).