This is a remake of the map "cs_siege" (otherwise known as Canyon Siege) for the first Counter-Strike. This is an attempt to show the potential and quality in Source map-making and, personally, this was one of my favorite maps for Counter-Strike. This map is a cooperative project between myself and MeCubed.
First of all the desert valleys are good made. There are many models (props), so it's also detailed. But there is a problem with FPS on this map. I think it's need areoportals. But without that map is very nice.
It looks good, but i think it needs some optimization. I would reccomend areaportals, occluders, and things. Also make sure you've got efficient brushwork. It looks very good though. Just don't forget that you're also engineering something to be playable on most user's machines.