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.