Pros:

-Great level design, diverse locations.
-Good detail put into the look of the map, feels great
-Long maps (especially Maps 1+2)
-Above average difficulty, can be challenging, but very fun
-A lot of "points of no return".  Forces the team to stay close, and makes for some intense tank battles.
-Path often splits, giving the player many choices to approach the same area.
-No major glitches
-No major problems with Bot Navigation
-Finale was somewhat easy (compared to the rest of the campaign), but was more fun than most Finales I've played.

Cons:

-Forced Tank/Witch on Map 1 is difficult and annoying.  Perhaps too difficult for the first map. (-0.2)
-Perimeter detail is lacking (hundreds of spots that appear to be open, but block the player).  On the other hand, zombies and infected are allowed to pass through these parts, making it possible for hordes to spawn virtually anywhere (very intense). (-0.2 for design, +0.2 for Functionality)

Conclusion:

Overall, one of the most fun (and difficult) campaigns I've ever played.  I've even found myself choosing it over many of the Valve campaigns.  The map layouts are fantastic, the atmosphere is creepy, and the gameplay is intense.  Definitely going to be playing this one again and again.