Pros: Good practice for snipers. It certainly gives what it promises.
Cons: Not enough variety. There aren't enough sniping positions, imho.
Improvements: you need to expand it a bit. Yes, I know it's a port, but nothing says you can't expand it. Also, some textural clean up would be quite good.

Another quick thing is your lighting. Your fourth screenshot shows it perfectly; that isn't really realistic looking. It's not hard to tinker with it and make it look good.
Notes: As above. I think just general clean up is needed here.

Pros: its a classic, interior looks okay

Cons: no playerclip on the top level makes it hard not to get stuck. skybox/outside area doesnt look to nice.
Improvements: make a nice 3dskybox - be sure to place solids behind those displacements to improve performance.

Pros: It's constructed very professionally.
Nostalgia Blast
Who doesn't love a good sniper war?

Cons: Equinox654 is teh suck ;3

Ok, I blocked off the top of the map where you cant grenade/rocket jump out.

I have just updated the map. It should have fixed a few bugs.