OK, a few things.
First, you seem to have no light_environment whatsoever. I say this because it's very dark outside and you haven't picked a TF2-themed skybox yet. I recommend doing that, by the way, since whatever skybox you did pick is somehow missing its sides. You can get the settings that match whatever skybox you decide to go with from
this list.
Secondly, you compiled in HDR without setting up a tonemap controller. Which makes the contrast between well-lit and dimly lit areas much more pronounced and fills the map with excessive bloom. For now I recommend just leaving out the HDR compile since the lighting is all temporary anyway, and possibly toning down the brightness of the lights as well.
Finally, the layout. It's really confusing where to go from pretty much everywhere, and it's not clear which doors open to you and which ones don't. If any doors are always inaccessible when closed, use the no-entry door texture on them. If some of them lock and unlock, it gets a little trickier. Valve mainly uses prop-based doors to deal with that, but there might be a way to make func_brushes appear and disappear to make it look like the door is changing skin. Anyone know anything about that?