Most of this feedback is on detailing since that's what I can mostly focus on without playing in a server, so some of it may not be useful at this point.
-The reflective texture on this door frame not only looks awful, it also uses improper reflections. I first thought it was a no draw till I looked closer. Also the texture under the catwalk is misaligned.
-I really dislike all this plastic you use. It doesn't look that great and is very repetitive
-the wood on this fence doesn't look right. It should all be wood or all be metal. I get that it's supposed to show some kind of gate but there has to be a better way
-ramp wall is black for some reason
-I like the sort of greenhouse thing going on here but it's difficult to tell which of the panels have glass and which don't at a glance without being up close to it or already knowing
-Why is there a rock wall all on it's own inside here? There aren't any other rock walls nearby so it seems out of place and rather lonely. All the other rock walls got to hang out together, the jerks
-These dirt blocks look awful. Ground isn't naturally shaped anything like that. It needs rounded out but, if you want to keep that shape, you should probably make it a building
-I can build a sentry here but the animation for it gets all messed up due to the angle. It's finicky to build here so I don't think it's something done on purpose
-MORE ANGLES. It should be rounder
-This geometry is very weird and stands out a lot due to the texture used opposed to the ones around it.
-no visualizer
-Does this open? It's got a visualizer on it but I couldn't figure out how to open it
-Walking out of the forward spawn here needs to give better direction. I'm drawn to the doorway on the left which leads backwards instead of the area on the right while the arrow billboard is mostly blocked by that rock.
-What is going on with this hazard tape? Is it feeling OK?
-I see that the angled wall here is to block a sight line but it not only looks weird but is annoying to have to move around. There's gotta be a better way
-vas ist das? Why is the roof like this? It looks like an invalid brush got fixed incorrectly
-It's seeping through the walls
-z fighting with this door. It needs to go back farther into the wall
-The ladder is taller than the silo
Lastly but not leastly the maps overall lighting is pretty bland. Everywhere outside looks the same and there's hardly any shadow. It just doesn't look right and almost feels fullbright at times.
That's all for now, I hope any of this helps.