I have played on other sites similar to this one where you were able to create games and select the rank of your opponents or at least the level they needed to achieve before joining. It was very useful. I have seen this practice used in tournaments before you could join. I believe it would encourage more participation.
i'd like to be able to create games with a minimum ranking required to join. i often "add foe" to players that have ratings under 1000, or those that intentionally tank their rating by joining and losing/timing out dozens of games at once.
it's annoying having a game waiting to fill with a bunch of 1500-3000 ranked players and then someone joins that is rated 440 or 770 or something and just plays dumb or intentionally deadbeat times out.