I agree about simply creative maps. there should be a separate category for maps that are meant to show the maker's architectural and creative skills. Skycastle, for example.

...that Skycastle is about to be playable. In the next weeks i will send the second version which will be a capture the flag based game-play. There are 11 flags to capture, each bases are located less than 10 second away of one or several other bases. Every places now has an interest in the map. To improve the accessability of some far located places, I put some teleporters :D. Now I 'm adding the ammos. I'm trying to put enough of them for each places.
Finally I just wanna say that Skycastle is not playable at the time because i didn't have time to finish it after I posted it. But its aim was not only about being a big piece of architecture, game play was an important part of its development .