Maybe you could do something with fog and fogdome to make the edge of the map less visible

Try this:
fogdomeheight 0.1
fogdomeclip 0.1
fogdomemin 0.0
fogdomemax 1.0
fogdomecap 1
fog 800

And delete the edge on the map, it looks nasty. Just put water instead.

Also, name your readme-files name_of_map_README, as now it get's ordered alphabetically at the R, which isn't next to your map.

As for the actual gameplay of the map, the geometry isn't pretty, but not that bad for fighting. However, you need to really re-examine your entity placements.

First off, you could do with some more, or at least differently placed playerstarts. One of them just faces along a wall and it's really easy to get killed from behind as you spawn. It should at least face out so your back is somewhat protected. Overall the playerstarts seem random and arbitrary.
3 is a lot of health for such a small map. IMO you should remove the one in the center of the map as players will be drawn there anyway.
As for the weapons and armor, they seem okay.

Because the map is so small, there should be more detail on what there is. It would definitely be better with more detailed walls, because that the main feature of the map. Also, try some hard shadows (higher lightprecision) because again, it's a small area so it won't eat up processing power.

Also, change /yawsky to 270 so the sun matches the shadows.