I agree with seeing ranking and games played. I've been trying to get someone challenging, in order to up my ranking.
The best I can do is invite someone on the top 50 scoreboard.
So far... Everyone has rejected me :(
Having a "Whos playing now" feature would be great.
I live on the other side of the world from most, so only get a turn or two in a day due time differences.
Perhaps even adding a "Region Play" option would be handy.