Sbmm is at a terrible state

Matchmaking in this game has been pretty disastrous for a long time now. The only way I can imagine it was good for you last season is if last season was your first season in the game. That would account for why the matchmaker was going easy on you. Now it thinks it has you in its clutches and will treat you like it treats the rest of us.

I've actually seen some improvement this season, but that only seems to affect the left side of the bell curve. Everyone else, like RockDokRock​ said, is doomed, especially if you solo queue.