No comments, 4/10 rating. Those are the best ratings, which are crappy and don't even say why :P

This map feels... old. Like it's straight out of Doom or something.
That is all.
До свидания и заткнись
-P

Pick a proper theme. Now it appears to be some heavy industrial space-like areas build into some urban.
Then, pick a fitting textureset instead of using any texture that fits the geometry.

Inside is clean futuristic, but have some old industrial parts, and outside is urban, with different types of bricks walls, the textures are spammed, the walls dont have "relief" they are plain and the textures just cover the plain walls, making an undetailed wall. the layout is labyrinthine (not very complex but thats how is called the style when there are no open rooms where you fight), is better when the map is formed for rooms and short corridors that connect the rooms, the labyrinth is valid to use, but is more hard to make it playable (in quake 3 there are examples of good and bad maps with labyrinth styles)
aesthetically its not good, there are a lot of things that could be better, the map lacks of details and the textures are not connect together succesfully.

4/10 (-6 for the appearance of the map, textures, details, the layout, the theme and the geometry)

PS: Dont be mad papriko, i always comment the reason of my votes in spite of my delay ;)

Thanks for the feedback, all.
I was going for a doom/quake feel with this map, so I guess I nailed that. The appearance/theme, not so much.
I appreciate the advice, but as you can probably tell from how long it took me to even respond here, I won't be making any changes to the map any time soon unfortunately.

Hopefully, whatever I work on next will turn out better than this.