I have the reverse problem - I host all welcome, a grey joins, and sometimes the other players get worked up when I refuse to kick them.
One thing that would be nice though is if game quality went off the displayed score, and not the precise ranking estimated when you hover over - i.e. a rank 0 is considered equivalent to a rank 1500 at the moment, meaning 3 rank zeros with say <10 games each are supposedly significantly better than 3 rank 1000s with 1000+ games. This means that you can't opti-balance with new players (at least you can, but you end up with horribly unbalanced games).