Pros: You made a very interesting layout, as far as places you can go is concerned. I really liked the fact that spawns are somewhat blocked off, but you can still get to them from the bottom. And I also was rather pleased by the style of the ramps in the center. I haven't seen that done before.
Cons: This map is somewhat bland, no props in it, or nice architecture, just very blocky. The windows above spawn, and at spawn are higher up than the players eyes are, so one has to jump in order to see out them. You have some misaligned brushes, as well as textures by the spawns.
And you also have full bright, meaning no shadows. You need to add a Light_environment and a env_sun to the map to give it a better feel.
Improvements: You need to add a Light_environment and a env_sun to the map to give it a better feel
I would also suggest you put props in this map, as well as more walkways and things to get around the map on.
Notes: Good map for a first, keep trying though. Mapping is tough to get into, but once you do you can make some amazing things.
If you have any questions regarding this assessment or rating, feel free to message me.