dm_powersurgebeta*(Not sure what the latest version is) is an excellent map. Lots of distance work, though, so the crossbow, mag, and rpg are hot weapons to grab.
Xen_sahara, in my experience, is extremely buggy. If you step on one particular spot, you automatically die. And the last time I played, I got a weird glitch halfway through that drained my suit energy instead of adding to it. Needless to say, I was pissed, and I left pretty quick. I'm pretty certain that it was the map, because I've never had that problem anywhere else.
In the past couple days I've been joining servers playing maps I've never heard before just to check out whats out there. Here's a couple tips to the mappers:
1) Throw some lights in there! I know looks aren't as important as playability but damn, some of these are just ugly. Even if just a couple of lights were thrown in it would be much better.
2) Take some time and create a realistic environment. The physics in this game are incredible yet so many of these new maps aren't making use of them at all. Where's all the debris? We need to make use of this gravity gun. This is the best part of the two valve maps: they are completely loaded with objects. When I play on these maps I don't even use any guns just because I don't have to!
