Pros:

-Large map, allows for players to choose where to hold out. Adds variation in gameplay and replayability
-Visually polished. Lots of custom content, all of which is pretty professionally made. No custom content that is too huge and fancy that would bog down people's computers
-Very good recreation. Lots of small and large details, all very intentional details which add to the awesomeness of the map.

Cons:

-The interior playable spaces are a bit cramped and not the funnest to play in, due to the author's focus on recreating a real-life space instead of creating a playable space that works well with L4D2 gameplay
-More of a parking lot survival map instead of anything else. I found myself running out of the interior spaces to give myself some more freedom of movement. I kept getting pinned in the interior spaces and died pretty quickly.
-Can clip through walls in sewers and see skybox
-I personally wish the author deviated from a real-world creation a bit more and used his skills to make a map that worked a bit better with L4D2 gameplay. Other than that, the map is quite awesome!

Conclusion:

Very polished map. Quite large with various places to hold out in for survival gameplay. The author obviously knows what he's doing! Props!

Pros:

-intuitive weapon placement
-usable window plank barricades to slow flow of zombies through windows
-small but fun map. It's big enough for a fairly intense and fun fight.
-Fun time-based room unlocking mechanism. Forces the players to pay more attention to the room they are currently in. Makes the player feel more like they are in some sort of story and they have a real objective, instead of to just stay alive for as long as possible

Cons:

-barricades can be built too fast (not much of a repercussion for barricades being broken down, you can build them up very quickly and easily)
-no real need to run around the bunker to barricade windows, just sit at an end that has the fewest windows and keep putting up barricades, slice zombies through windows, and then kill tank(s) when they come
-serious nav issue at stair case. Survivors get hung up on the railing. Check your nav connections.
-too easy to get gold standard
-too easy to exploit tanks when they very slowely crouch through windows. You can even melee them without getting punched
-due to the size of the map, players are not given very many choices for how they could play. Not too much replay value

Conclusion:

All and all the map is a fun little map to play. I only played it by myself, but I was able to get gold standard pretty easily. I am not too sure how much replay value it has due to the fact that it's size is fairly small and it's simple yet effective design limits the players choices for varying up the way they play the map. Sure, you can keep playing the map to try to get a higher time, but you'll most likely be trying one of a few different ways to survive, since there are only a couple rooms to the bunker and the entirety of the map is all pretty similar.