Well just to jump on the bandwagon, I had a run through as well. The screenshots really made it look incredible, but in game, while still pretty, it is less impressive. I spawned at the top of some fire escape on the outside of a building, and found my only real choice of route was to head down two stair sets, a ladder, and run along a platform - much too far a distance to travel without being offered an alternative route. The fire escape was also only really wide enough for a single person to fit past. I was unhappy to see this was the case with the vast majority of the map. The main interior section had potential with all the criss-crossing upper tiers, however again it is just one linear path in essence. Worse still was the exceptionally cramped lower sections - being forced to duck under train carriage connectors, and even having to crouch to get through what claims to be a doorway, just doesn't lead to a good deathmatch experience.
With looks like this, the author obviously has huge potential, but he needs to play some deathmatch games.