This matchmaking system

Is literally garbage. Hot stinking refuse. I have played too many blowout games where diamond premades are playing against me and my bronze/silver friends. It isn't fun, it isn't in the SLIGHTEST a learning experience, it is just a 20 minute stompfest until surrender.

Please for the love of god put some logic on this system that at least caps diamond players to play against similar skill levels.

Hard mode: don't use the words "hidden MMR" or anything similar. My premade team didn't suddenly jump to plat/diamond MMR between games