With war3, we always had to download 10 different maps manually and put it in the "right" place to watch a replay. For instance, the replay wanted the map in:

With war3, we always had to download 10 different maps manually and put it in the "right" place to watch a replay. For instance, the replay wanted the map in: maps/download/(2)blabla and not maps/frozen throne/(2)blabla. I honestly hope that blizzard will fix that by hosting everything. And I'm sure that if 25mb is not enough, blizzard will increase it.. It's one of the few game company that encourage users to create maps and fan art. Lastly, in my 10 years playing starcraft1 and warcraft3, I've never seen a map with mature content or things like that.. so in my opinion, it doesn't make a difference whether blizzard control maps or no.