Pros:

Homage to Dawn of The Dead (Remake)
Long Campaign
Interesting events

Cons:

AI can be incredibly stupid at some points.

Conclusion:

While the con really isn't a con, you are way better off playing with a group of people. Because the events such as when you have to close these doors can be really difficult with the computer AI.  

This has got to be the best Add-on campaign I have played so far!  This is definitely a must have campaign. It feels professional in quality, like it should be one of the main campaigns.

Pros:

Level Design
Interesting Finale

Cons:

No ammo stash at finale

Conclusion:

While this isn't the best add-on campaign I've seen, it is definitely one of the better campaigns I've played.  Its a good campaign if you're looking for something new to add to your Left 4 Dead 2 world