This is a big map, and I like big maps. It does get really confusing at times though, but overall the layout is alright and there aren't too many dead ends.
The first thing that needs work, IMO, is clipping. You can't really tell what's 'inside' the map, and being blocked by an invisible wall seems a bit sudden. The most glaring example is here:

- What mysterious force is preventing me from going through here?
Another example is the waterway leading out of the map (in the second screenshot you posted).
My advice is: if you're going to add clip, I'd suggest adding it around only one specific type of terrain (for example make it so that you can't go on top of the rocks) and then add
visible barriers for the other times when you want to block the players. Also, it would be a good idea to add a ceiling of clip, since in some places you can wallkick up and over the clip and hide outside the map.
Other advice:
-Found an error here:
(Also, borders are nice, learn to love them)
-I've never seen a brick railing before.
-I like the color of the rocks and the color of the bricks in the center area, but the textures repeat too often for my tastes; maybe a larger rock texture (like one of the jojo/redrock textures, or just use same texture and /vscale 1 or 2) and a more flat, less contrasty texture where the bricks are in the 1st screenshot you posted would be better.
-Like Quin said, the large areas of deep water aren't the best for gameplay. It looks nice, but shallow/wading water would look just as good, especially with some pieces of cover (like in panic).
-There are jumppads at the bases of the 'waterfall stairs' in the center area that don't make sense why they're there.
-'numplayers' value should be WAY more than 4, more like something in the 10-16 range if you ask me.
- Bots get stuck in a few places: near the bay at the pipe going to the secret room, and over on the other side near the barrels. They also tend to fall in the big circular vat of water at the other end of the map.
If you'd like me to work on things and go through the map in detail, I'm down with having a coop edit sometime. Just stop by the
Doom clan IRC.