Pros:

+Short quick campaign
+Good Mazes
+Items found off the regular path
+Great use of music
+Great scare moments
+Awesome use of multiflooring. The offices that have a hole in the middle in the same area on each floor is an awesome idea. Value needs to take notice to this idea.

Cons:

-Starting cut scene the sky changes color from light grey to dark grey. The camera seems shaky like a robot. (I made sure no background progams were running, and I played single player offline too. Just to make sure.)
-Bill became stuck at beginning of 2nd map
-Even when the door is closed, bots will not get in elevator at the end of the 2nd map.
-New Voice add on needs to be louder and clearer. Took a long time to figure out that we had to run to the safe room or fight the never ending hord after firing the big gun.
-Lower background at finale needs more work and detail. It's just all black.
-Needs to have a viariety of weapons. (This could be because the campaign is short).

Conclusion:

The offices with the hole in the center of the floor is great for a smoker pull. Putting more powerful weapons scattered in each would force the survivors to go inside. This is a very good custom map. It just needs a few tweaks.

Pros:

+Long, great, and challenging detailed campaign.
+Lots of heart pounding moments. Realizing you have to travel the same way back through the alarms, and the whole place is burning and melting around you.
+Story add on voice over is a great addition.

Cons:

-Story add on voice over needs to be louder and clearer.
-Tons of moments when the hord spawn is abused. For example the bathroom near the start of the safe room when you run through the alarm. I wish there was a way to get around the alarm.
-At the start of the Final map, some random glitched caused us to not be in the elevator. We were below the map like we missed the elevator. I had to kill everyone including myself to restart the current map.
-There needs to be a indicator where the gas lever is to start the final event. (It's the area right below the helipad for people new to this map.)
-Difficulty level is too high even on normal.
-Randomly getting a new weapon in the hand before you start the journey back.
- Is there any way possible to have falling more falling debri and better flowing water effects?

Conclusion:

-One of the best maps for Left 4 Dead 1 and 2 I have played. I have played many custom maps. Please keep up the awesome work.