They started from scratch, had a great idea, and made something much more terrible that what is in WC3, worst finish of a good idea I've ever seen.
Populating the map list by most popular is fine, and is a feature I like to have, but making it the only sort-order possibility is just plain dumb. Making a sorting order of newest maps, or most recent updated, like the default sort-order on THW, would make the bad maps fade away, but giving the good maps a chance to move on to the popular list, not like now, when the same 10 most popular "maps" (which also was the first maps to be released in the full version) has dominated the list and downloads, since only very few people look father down the popular-list..
Blizzard know of this for sure, and I think they knew this system was very bad even under the beta-tesing, but simply didn't had the time to change it before release, I hope they include it in an update much soon. I will not release my RPG on the current map publishing system, since it will not recieve the attention it needs!
If I'm wrong, and they keep this system, I will personally go down and public spank every employee at Blizzard Entertainment untill they promise to fix it! So no matter what happens, I promise that things will get better, and this system fixed
EDIT: I'm very serious about this!