Pros:

Great environment!
Well placed hordes, tanks, specials
non linear
nice attention to detail

Cons:

3rd and final map has invisible wall.  Tried restarting, nothing helped.  The wall is located at the very top of the hilll where the rock outcropping is.  Does not allow passage to get to final building.

Conclusion:

Overall, this is a great campaign.  Fix the final chapter and you have yourself a winner! 

Pros:

-Incredible scenery
-Custom detail is professional
-Colors and environment are visually stimulating

Cons:

-Length of 2nd level is next to impossible on expert
-no medpacks for 2nd level is next to impossible
-bugged out ladder at the end after the gondola is beyond frustrating

Conclusion:

I haven't gotten to the end because my character fell and clung to the edge where the elevator shaft is at the end of 2nd level, so I cannot give my opinion of the finale.  What I have experienced was incredible and impressive.  The level and attention to detail boggles the mind.  Very impressive campaign