One might say you followed the concept art too closely. The result of which being poor gameplay and an inconsistant art style. If it wasn't for the standardised TF2 props i probably wouldn't guess this was a TF2 map.
There's using outside sources for inspiration and reference and then there's out right ripping it off (with little thought as to the consequences in terms of both gameplay and art style). Fortunately for you, the average player jizzes their pants at any map that has X amount of props thrown in them rather than the accuracy of the art style or theme achieved.
questionable rant:
I don't mean to be rude but you seem to be oblivious as to the actual process that is design. Whipping out copies and replica's of everything else with little to no originality. Even going as far as to copy and paste work from other vmf's (in the past) rather than attempt to create it yourself and maybe learn something about the deeper intricacies of Hammer.
I can only hope you realise sooner rather than later what it is you're actually doing right now, compared to other people and their maps. I'm not saying this just because i've found out you've used something as reference and am able to use it as an excuse to be rude and abusive but because you've copied something so closely it resulted in a negative impact on your environment and you wern't even able to anticipate this; and this isn't the first time you've taken from something else without modifying it to a reasonable degree that at least you might fool people into thinking the map adds a fresh character to custom TF2.
Level Design 101: environments produced for differing games and game mechanics (concept art or otherwise) inevitably play more poorly than original content designed for the game in mind without strict modification and compromise. Just look at 2fort and dustbowl as prime examples. Both considered aweful despite their apparent popularity, but still achieving that popularity due to heavy modifications to the layout and drop placement. Even in this example we're dealing with incredibly similar but still dissimilar game mechanics (TFC>TF2) and the result is a sub par map. You've gone the full mile with a Halo design. I was wondering how you produced a map that strayed from TF2 game mechanics so horrifically and now we know why. You based your design incredibly closely off a non-TF2 design.
Dan Gilbert, although only reiterating known facts, tells us that the human brain is an amazing device. As self aware sentient beings we have the capability to simulate experiences before we physically encounter them. I have never seen this capacity from you in your maps and you continue to run into the most basic and avoidable mapping mistakes (despite the fact that you manage to get your maps into late beta; probably because of the general ignoring of feedback you like to do in regards to feedback you don't like to hear)./end questionable rant.
edit: Either way, you've worked hard and well done on getting the map this far.