There is a simple fix to that. Ban all smurfs. Or if we really have to punish all groupes then put every 5 stack up against a full team of AI heroes if the MM cant find a balanced game to them Then no solo player feelings are hurt.
Then 5 stacks can come here and complain they never get to face real players just because thier mmr is too high. Normal groupes should not be punished for what a small groupe of ultra high mmr smurfs are going.