Flex queue doesn't suck
It's just new. Apparently 80% of the players expect that Riot should be able to do any and everything perfectly. Yes there are apparently MMR issues but why the heck are you so surprised for a brand new queue? And how is this even so much of a problem. It's not even the official season yet. It's just preseason. If you get matched in a diamond game and your bronze don't get yourself depressed and tilt. Just try your best and learn something from the game. MMRs are going to settle itself soon enough. The only people who really have to worry about their MMRs are people who were boosted so as long as your MMR reflects your actual skill level you have nothing to complain about. So stop complaining that it sucks. If you can't have fun with a little mismatchings then just play normals until the dust settles.