Pros:

some neat areas
NO game breakers
solid in a whole

Cons:

bad 3d skybox fog
empty and sometimes boring
The events like the door are just silly

Conclusion:

Nothing terrible in the campaign but tbh nothing fun either.Nothing that makes you wanna delete it but nothing that makes you want to keep it.
I think the author does have a few issues in the fact (like quite a few others)he thinks what he makes is better then other campaigns which is a shame...I read a few of your remarks on the mappings list and we discussed it with a few mappers and tbh what you said was lame...You went on saying that crappy campaigns and maps where featured on the first page and got hyped and highly downloaded which left other campaigns/maps like yours a bit in the dark and it was a shame..

Let me teach you one thing,when a map is good/fun/awesome peope will download it ,play it and share it.First page promotion or hype or whatever you were going on about dosent change a thing and never will.people like a map?they will download it and play it.
You must be frustrated people dont like this much and you only got 20k downloads.
Want a few exemples? your campaign wont and will never be featured on the valve blog and if you look at the "big"campaigns on here (before being featured)were being played A LOT before any kind of "promotion"
Detour ahead big hit ,haunted forest same,2evielyes most succesful campaign out to date on l4d2 with city 17.All that with no promotion , no site ,no hype  no nothing.
Want a reversed exemple? I hate mountains ,huge promotion ,sites , blogs,videos ,bla bla and just went down like a totally normal solid and good campaign with "only"110k downloads.

Admit it this isnt worth what you think it is.Dont get me wrong its not bad,crap but just got nothing special what so ever and replayability is near...zero.