I think this is a good start for a beta and of course it is not finished. This shows as well. Some areas feel very plain and I guess (hope) that you will do something about them in regards to props, decals and textures.

I must say that the stairs leading from CT spawn up to A are awesome. Great work on the displacement and they look very real! Your work in general with displacements are good and you make it blend well. Keep up the good work!

You need to find some other barrels. The ones you have now with radiation signs on them seem extremely misplaced. It threw the feel of the map off great bit for me. Hence me commenting on it now.

When I run around the map I get a feeling that the rooms are separate entities and not really connected. Each room by it self work quite fine but sometime they feel out of context with the adjacent room. I am looking for a common theme but that could be something that you have in your mind for future versions?

Hope is helps.