Pros:

Detailed map.
Straightforward
Interesting theme
Campaign Duration is Just Right.

Cons:

While great detail, the design gets really bland really fast
Finale and crescendo is too easy and escape boat is to far from finale start
Heavy reliability on Melee
Enemy spawns too high, even on normal

Conclusion:

I'm not gonna lie, I wanted to give this map a lower score but you have quite a few things right so far.  You just need some polish. 

Pros:

AMBIANCE!
Lots to explore
Plenty of nods
DAT ENDING MAN! (if you get it than you know the secret)

Cons:

Too dark at points
AI bugs at occasionally
The intro, though good has ended more runs than I can count.
Hard to get your bearings in the open areas.

Conclusion:

Nice nod to Silent hill and I did enjoy playing it.  I do recameand playing it to both SH Fans and regular players and it dose make L4D's silly scary into Legit scary.  It just needs some polish.

Pros:

Easy map for newbs.  :D
Weapon and item searching system Awesome.
Better defense than most Lets build maps
Can be beaten (Easier than most lets build maps) solo.

Cons:

Large map means lack of infected
Buggy AI
Buggy tank
Final starts up when you have everything BUT the gas on and started from the gas station.

Conclusion:

Fun map to play as and if the problems are fixed It would get a solid 10.  Dosent stop me from playing it though. :D