Pros:

Level design
Length
Atmosphere

Cons:

Difficulty (!!)
Too much supplies

Conclusion:

This map had probably one of the best level designs I've ever seen, the attention to detail was incredible. It really looked and felt very japanese and very unique. Great job on that!
My only (but very big) problem with this map was the fact that it was without any doubt THE easiest custom campaign that I played. 
We were able to run through it on expert/realism on 1 attempt without dying once which is in my opinion unacceptable. There were absolutely no challenging moments, there were supplies literally on every corner in such amount that it actually wasn't possible to use them all.
There wasn't enough zombies and hordes (we encountered a bug where zombies stopped spawning so we had to restart once) and tight situations.
It the goal of this campaign was to create an awesome visual experience then you succeeded and did a great job but if this was supposed to be a challenge then it's definitely not enough. I'd rate it 10/10 for design and 5/10 for everything else.
I also forgot to mention that you can completely bypass the finale by carrying the canisters to the generator before you start the mission.