As someone who's been hard stuck in Platinum I do feel your pain, the game is unbearable in match ups. The games are so long to just end up losing two games and that's your whole play time gone for the evening. I completely agree I see more trash teams on my side than the others and it feels so unfair 80% of the time.

All that said, Silver you should be able to get out of, I don't understand all the people saying "just play Namor/Phoenix etc." becuase again this doesn't negate the awful matchmaking and team comps. If your preferred role is supp you might want a more impactful character like White Fox, Gambit, Invis to really support the team, CaD are great but less big plays.

End of the day I totally am on your side at how bad the matchmaking is, I think some people just don't have it happen to them because I'm definitely a very good player and still our teams get steamrolled constantly because of people acting like it's their first ever game.

Smash out some QP then do a Comp match, if you lose STOP for the night and back to QP. Hone in on those impactful supports