Right going to be really truthful here so please take it all in for your next creation..
pros : looks really fun to play either if its for messing about or for actually a good play for a long time, kinda reminds me of the old times on halflife 1 deathmatch, so i give u credit for the nice layout,
cons : i think i can only see about 10 textures in all of the map
improvement : take more time on detailing, adding props, displacements better lighting setup so theres more contrasty shadows etc, a 3dskybox would fill in all of that unwanted sky space, handrails and things on the interiors etc, theres lots of things that would just give it a face lift, am not saying it looks bad but its crying out for a bit more detail, also those clan signs in maps built using brushs are always better being a model or a flat texture,
keep it up anyways!