Old map idea, saw this like 5 times on quadro.

fill map outside > less wtr.
buildings are more weird (an entire building just for stairs to get on the top to snipe..
"command tower" > one way to hide?
unbalanced > diff weps /side

hmm did u played halo?
bcuz the idea is just like from halo :P really!

3/5 buz i love halo and it has nice atmosphere with that fog ;)

I feel the Halo-ness of this level too (Massive Lockout, much?) but this level needs more in it
More lights, to make it more interesting. Also use different color lights.
More cover, so people don't die all the time in the open.
More geometry, this level is very basic in that respect.
Also, I would recommend that you shrink the level a bit, for sauer gameplay.
Btw, I went outside of the level and found you had used \-shaped cubes for the walls and cloudy skybox. What is the point of doing that?
Just my thoughts. 3.5 stars if it is your first map.

Good idees no finitions
Maybe it's a good ID, but You have to more work on details
Sorry for my bad english :(