My biggest problem with this map is that it's pretty much entirely symmetrical, which is boring. Some of the more impressive details/architecture are overshadowed by how cluttered most of the geometry is, which is accented by the incohesive texturing. Even though the map is supposed to be divided into four entirely separate areas, the texturing within each area isn't strong enough to pull this off. The weapon placement was also very haphazard and distracting. The lighting on the other hand was done fairly well.

I think you could be a fairly promising mapper, but this map isn't really worth keeping. If you want to make a map around this sort of theme again, don't make it so symmetrical.