Win or Lose, isn't a good way to tell how good someone is.
This is a team game, you can't base a individually players skill of 4 other people. That just doesn't work.
Idk how, but couldn't you come up with a better system for Ranked, other than , oh he went on a win streak, welp he's in Gold Now. Even though he's a Silver V lvl player. (In terms of mechanics, decision making, and pretty much everything)