What if quick play only chose from servers running maps that are white- listed by reviewers that each client can select herself? Then you could simply subscribe to a reviewer whose tastes coincided with your own. And it would encourage participation in the map workshop/whatever with people trying to review quality maps.
If there was a map workshop where you could subscribe to maps, then have the browser look for servers that match your subbed maps. Could work?
But what about people who don't sub to workshop maps, or know they are there? We're back to square 1.