I can't see a reason for Normal and Ranked games to have separate MMRs
Every game I play is against Diamond players, meanwhile I'm new to the game, just hit level 30. I'm definitely not good enough for these, and the fact that I keep getting stomped should reflect that. Even if somehow I was a Diamond level player already I'm definitely not going to win with the Silver and Bronze players I keep getting matched with against said Diamonds.
If they're Diamond skill level, they're Diamond skill level. It doesn't magically change in normal games. This is a very unfun experience and I'm tired of auto-losing games.