Pros:

Unique Level Design - Its always a challenge to find the way. In every map you have to do something to go on (find keys, solve puzzles, collect cans, jumping parts, shoot barrels etc.) 
Unique Puzzles - All puzzles are very creative and ambitious. Never saw any compareable on l4d2. The puzzle on map 1 is a bit too hard. I needed a long time to solve it. But it was fun.  On map 2 u have to find out a code combination and the survivors have to cover the player on the puzzle.
Custom Melee Weapons - Lol the Mop :)
Items - The items are very rare and placed on good spots - Some are placed in secret areas or in boxes. You have to discover the whole map to find some items.
Challenging Events - In every map there are challenging events, that stops the survivors in their progress. Some events have endless hordes. The survivor need to rush.

Cons:

Missing final. 
Some puzzles are too hard.

Conclusion:

The keyword for this campaign is "Unique". Never saw so much new creative ideas on a custom map in l4d2. In my eyes its a new sort of maps. The main problem on this map are not the zombies, but rather the puzzles and the wayfinding. Its a great map and it shows some new possibilities of mapdesign on l4d2.
Good work man. Hope this work will go on. When the final is good as the first maps, i ll give u a 10.

Tested on realism expert.