I gave it a 1/10
One of the main flaws of this map is the lighting which looks plain, you should try adding some light effects all around, this would make your map look much more realistic.
The textures are low-quality and too repetitive, this makes your map look boring and ordinary. Try adding some objects to walls or even remove the ceiling and add a nice skybox.
It also lacks some cool objects all around which could serve your to cover. You need some good collision objects, that would make things much more interesting.