Please allow players to flag bad matchmaking
Give honer 3+, gold+, players a flagging tool to provide datapoints on games that have a clear+huge mismatch in team wide elo and/or role.
Also allow flagging of HIGHLY inconsistent behaviour from players that are boosted/intoxicated/heavily tilted/playing like the game is a joke (e.g. when elo doesn't represent gameplay). Use a tribunal system to encourage more consistent play.
A small team+datamining tools to curate the flags and you have amazing datasets for improving the problem areas of player/matchmaking inconsistency.
Keeping the tool a privilege makes it easy to protect from misuse.