Normals matchmaking needs some serious work
The system is putting silvers, golds, plats, diamonds and master in the same game. This is the bottom 10% of ladder playing in the same game as the top 0.5%. Along with average and above average players in the mix, why not...
I really think your normals MMR needs to be based in part off of your solo/due rank. Since they are separate, some very high ranked accounts seem to have low normals MMR from never playing it. Sc2 did this. after you played your first 20 ranked games in a row, it seeded your unranked MMR based on that (if you played no unranked) so you didn't have to go through the new account -> stable MMR process twice. That way, if you played ranked only until masters you would then play unranked against at least diamond players.
No matter if you are playing a different role or taking it less seriously, a masters player laning against a gold 4
along with silver players on both sides is a joke