as stated above, the textures tile a bit too much, if you break up some of the walls with detail brushes and overlays it will help immensely. also, dont underestimste the power of lighting, you can really add a lot to plain areas with dramatic lighting and shadows.
the scafolding-like structures might be a little weird too in game play, as they don't seem substantial enough to withstand repeated abuse from rockets, grenades etc. sometimes things like this can't be helped, but something to think about, as those sorts of things can mess with the suspension of disbelief for your players.
to Snipergen, your first comment makes very little sense. just because the layout was designed for another game, it doesn't mean it wouldn't work for TF2. it may have issues, but then again so will any map, designed from scratch or not. the important thing is to be flexible in design and try to get some game test feedback in order to see what works and what doesn't.
try and be less subjective in your comments, and a little bit more friendly in your tone. as it is now, I'm at the point where I basically skip reading when i see one of your posts.