Very well detailed map, with lots of care around. However, there are two big cons that plays negatively towards your map:
The map is too dark. Even after rising the brightness and gamma settings over the default ones, a lot of places have shadows strong enough for playermodels to blend in, as well as corridors in total darkness. While this would be acceptable somewhat in SP, it is not in MP, as it's easy to miss not only other players, but also items as well. It also doesn't help make the player being disoriented, as mentioned next
The layout is relatively complex, with several "dead end" rooms, corridors that make you run in circles easily, and being kinda big. Also at the train section, the navigation is weird when you come from the lower level, as you have to jump several times and avoid falling into the deep.
If you could raise the general brightness, add more entrances / exits to several rooms, as well as some playerclips around to help navigation, it would improve vastly the map.
Great brushwork and interesting modern flair in the design.
The layout is the only non wow factor.
Good job!