Has it changed much since the first year or so? I was pretty big in that community but the reality was the editor was too difficult for most people and the popularity system ended up creating a cyclical loop of the same maps (ie similar to the app store problem).
The brilliance of WC3 was the named-game system that allowed people to host whatever and fill games instantly. Battle.net was much more social-friendly too, and the editor itself provided a lot of power, but was not insanely difficult to figure out. I found the custom games in SC2 were of quite low quality just because of how much work it took to do anything.