Recently there was a really good BTB map made on Halo 4.It was made by the HB clan’s Engineer LegendaryOO7.See the map Here.
This belongs under the Community Creations section of the forums. You can will get a lot more feedback there.
If I may give some feedback:
The map itself is barren. There is a pair of buildings, a big wall between them, and nothing else. It seems like such a waste to use the large island for something so basic.