Not only have the ability to choose rank +, but also the ability to chose rank -.
This might stop a lot of quitting due to the self intimidation of playing a higher ranked player in multilayer games, and making upper ranked players pissed because they quit.
OR
An upper ranked player getting the boot because a lower ranked instigator of a game boots a higher ranked player that joined, therefor pissing the upper ranked player off again.
This is has just been my experience, and a contribution to the wish list.