Alright so this campaign is tough to give any "bad's" on but there is a few but I wont cover them right now, what is more important is the gameplay overall so here I go:

To start I got to say the map overall is really damn detailed, it mind blowed me a little bit because I can't see many maps that are this detailed for this amount of levels. The gameplay was great I had fun I would probably have alot more fun if I had friends that was able to play this with me, maybe versus could work too but I am not sure since I haven't tried yet. If this was an official Left 4 Dead map I would even pay for this map if this was a DLC, I also like the transitions through out the map. I also liked the Half life prison, really fitted the zombie vibe there and getting lost :).
Anyways overall this was an awesome map but sadly I have to break some of my negatives which are the following:

- The map is hard even on easy
Yes this map I thought was too hard even played to easy and I could imagen what would happen if I played on expert, it would've probably taken me about 1-2 hours to finish or even longer and I will break down why I think so.
- Loosing track and can't find ways
This is the most negative thing I've stumbled upon during the gameplay, that I get lost sometimes not finding where to go, I would suggest putting more hints because I got lost atleast 3-4 times each part.
-Optimization
The map is very detailed and thats good trust me, but there were times where I would get significant frame drops due to the details, maybe you could make the map a little more optimized

8.7/10 for me really cool but could be better.