Let me say before my review that upon seeing the screenshot, I immediately downloaded the SVN of Sauerbraten. This map was my motivation!
I see again you're branching out into different themes. Your earlier sci-fi map was much better than this one, so I can't blame inexperience in this genre, and of course looking at your past work I can't blame you as a mapper.. Maybe I'll blame the fact that you spent a weekend only on this.
Texturing is basic and uninteresting. The justice textures don't really provide enough variety for an entire map made out of them; they need things like natural landscape to balance them out and break the monotony of them. Case in point, you used the same gray base texture practically everywhere, making seperate architecture blend with eachother rather than standing out as details.
I like how you can climb on basically everything, although in a map like this I can see it being a problem. Campers will really abuse it, especially in instagib, since you can get all the way to the top quite easily.
The flow is bad, I think. The interconnected staircases are a good idea, but I think they'd be better implemented in a larger map. The stairs in this, a small map, make up most of the middle of the map, and stairs should never be the focus of your map. In other areas it just seems broken, such as the series of platforms that are piled on one another and must be jumped on to allow the player to access them. The entire corner of the map is broken that way. I understand making some areas "tricky" to use, but this makes up a good chunk of the map and really ruins the flow for me.
There are some creative parts, such as the jumppads and the glass barriers, but largely this architecture seems like cheap Halo.
The lighting only enhances the basic architecture and texturing, making them more obvious. Nighttime (with many lightsources) would probably be a better environment for the map, but that's just my opinion.
I'd say 5/10. Some parts are pretty good, but this is not an overall strong sci-fi map, and I can tell little work was put into it. That said, it was little work done by a good mapper, so there are redeeming qualities in it. But I'm of the philosophy of committing to the project till it's perfect, and this has a long way to go before meeting my standards (and my standards of you). Plus, I generally dislike arena-esque maps.
![MBT9_v.4 [28.04.10] - by t-chen](http://quadropolis.us/files/mbt9.1.jpg)