...lighting indeed looks a bit bland, many parts of this map even look fullbright...try to give it more contrast by using more shadows, and maybe lights with smaller radii (also try to use some different light colours for different types of light sources). There is a bit too much ammo too, imo.
You did a very good job with these 10x10 circles...just awesome ;)
A pity that many parts of this beautiful map are clipped...the upper section for example...one is able to walk on the inner roofs, but not on the walkways ? Why ? Is it so one isn't able to look outside where there is nothing ? Just add some trees there perhaps, or use the sky texture so one can't see the unfinished parts at all ;)
I give you 4/5 for this map :D