Pros:

Good map design
Long campaign
Good story idea
Challenging ending/final chapter

Cons:

Throughout most of the first 3 maps, the special infected would spawn miles away from the survivors, making it extremely boring and easy.
The parts in which you would alert the horde seemed like there were about 5x the normal amount of zombies. Though not hard, but made those points in each level drag out for longer than it needed to.
This may be due to the bad special infected spawning, but most of the levels seemed too long, and as a result, boring.

Conclusion:

Over all, good maps, too many zombies when you alerted the horde, not enough when you don't. Slightly glitched special infected spawning, but the long campaign and good ending made up for most of it.

Pros:

The music was nice.
It gave a bit of a challenge near the end with the anti-gravity thing.

Cons:

Looks like the whole campaign was created by someone who just started using the map editor
Extremely drug out, especially for its length
Terrible ending/final chapter
This isn't parkour 4 dead. The cliff part is extremely easy to fall off of, especially for the bots.
The spiral tower part has to be THE worst part of the whole campaign.

Conclusion:

Terrible level design played through with decent music, bad challenges, and a horrible ending to top it all.