I wish there was some more color and different lighting. I hate the golden haze. That all said, I can't wait to see what the community can achieve. I do think it should've been there at launch, but I'd rather have something that works and is great, than something that is half-baked.
How will they integrate it? I wonder if they'll introduce new methods of file sharing as well. Since the game is 60fps locked for all modes, I wonder how strict they'll be with map performance before putting any community creations out.