Pros:

(Conclusion may contain spoilers)
-Finally a Canadian City :D
-Lots of "surprise" special infected
-CN Tower was awesome
-Unique finale (conclusion)
-Putting medkits in crates was a cool idea 

Cons:

-Custom sprays looked 3D and fake
-Too many ladders for bots
-Finale was too easy
-Some textures were missing
-Jukebox had no music

Conclusion:

To conclude, I was a fan of this campaign. Most of the cons weren't much to worry about, but I think you should have made the finale a bit harder, as I beat it on my first try on Expert. Besides the finale being easy, I thought it was very unique being on the border of Canada and the U.S. Although the one Tank before the finale seemed to be too easy to kill. When I was entering the finale and the tank came while I was on the catwalks, he never made it up to us, and I was able to kill him with pistols, lol. Since I'm Canadian myself, I loved killing infected in my own country. :D Good work on this campaign, just a few kinks to be worked out.

Pros:

Most places were just right in difficulty
Unique
Very fun
Awesome port from HL2
Epic easter eggs!

Cons:

Too many zombies when you need to turn the alarm off

Conclusion:

You did a very good job with this campaign, Mixmedia. Infact, it's one of my favorites! I also loved finding the zombies and combines. That was a cool addition. Me and a couple friends played this last night and we were blown away at the epicness! (is that a word? lol) The only problem we had was the amount of zombies when you had to turn the alarm off, but it was no big deal. Anyways, good job!