The rating system is fine - for strong players.
There is a "minimum Table Level", that strong players can use to keep
weak players off the table
But unfortunately, there is no "maximum Table Level" to keep strong
players away. The possibility to seat all players is not much more
than a workaround.
So PLEASE strong players - patricipate in games with equal opponents.
Tonight someone with ranking >50 joined a table that was called
"beginner's",
That's not fair - it's not funny for the other three to loose every
game and besides have the ranking ruined.