Well, first of all, no lighting is awful especially for dev texture maps. It is hard of the eyes and brings down the gameplay.
The texture are dull throughout the map. You used the same orange and grey textures. Also those pillars look pretty bad with that texture. It doesn't fit in at all with the map and doesn't work without lighting either.
The layout isn't anything amazing. Just a bunch of hallways to form a simple maze on one end with mass pillars on the other. There is little cover other then the pillars, not even some props to hide behind.
The brushwork is also pretty bad in some areas, you have some walls that go through other walls. Also those pillars look pretty bad. All you did was spam them on the one side of the map as if you got even lazier. They are way too tall, textured poorly, and don't make for exciting gameplay.
It doesn't look very fun, and what the hell are those huge pillars of random textures?
Oh, and what do you know, another new map without lighting. I'm getting kinda tired of people not even bothering to place a light_environment.