The gameplay of this map might be the greatest thing since sliced bread, but the fact that you spent time changing the textures on surfaces when you weren't even sure of the gameplay is a core problem here. The reason people are reaming you about it is, this looks like a map that someone would actually release. Just go check out the content releases forum on the official forums. There are tons of maps that aren't alpha or beta and look just like this. And, in fact, you didn't even indicate in the title of the thread that this wasn't complete, so plenty of people surely clicked in here expecting to see a final and complete map and turned out with this.
If you want to turn around opinion in here, change to the default texture or make the map at least look plainly nicer (meaning you shouldn't have a platform floating out in the middle of space, that's a cardinal sin of UT mapping).