Pros:

All the Mutations avalible
Really good

Cons:

Unable to play Singleplayer mutations offline

Conclusion:

Very good :) thank you

Pros:

Brilliant Recreation of Helms Deep
Awesome Soundtrack
A Great Story based Survival Map
L4D1 Surviours
A Really fun and challenging experience

Cons:

No Bill?- i would have thought it would be better if Bill was in it (i know Zoey, Francis and Louis are there but it feels  sort of "incomplete")- can you please add him in the future update :)

When Retreating to the tower where you have to protect the gate- it doesnt really tell you how to defend the gate.

Cant find the NPCs but then agian it might be upcoming so 

Conclusion:

I would say that this map is one of the greatest Survival Maps i have ever played- its challenging yet rewarding (i have only played this with bots but still) its fun and you have put alot of effort into it so i salute to you 
BRAVO :-)

PLease Add Bill though