The team matchmakers were designed and added largely with the intent of more easily allowing lower rated and new players to join and find games. It is harder for players to get custom games when they are new.
I have nothing against that. The problem I am trying to get at is that most games where a 0 rated player is added ends in a forseeable defeat for the team with a 0 rated teammate. Which has little to do with the skill of the three other people in that team and is simply frustrating for that team.
Another option would be to have the first x games with 4vs4 games with a 0 rated player be unrated/highly decreased in rating weight for the other players.
Maybe the minimum balance % of tmm should be increased.
48% is just not playable imho.
The point I am trying to make is everyone at the start of such a game knows whats going to happen.