Pros:

- Pretty long
- Good finale
- Custom audio adds to the atmosphere
- Plenty of items to work with throughout the campaign
- When the level design is good, it's really good

Cons:

- However, some areas suffer from subpar level design; almost the entire 4th chapter was pretty tedious to run through and looked dull compared to the rest of the campaign.
- Trevor
- Way too many tanks
- Zombies spawning from all directions every minute, which ends up feeling spammy and artificially difficult

Conclusion:

Played on Advanced for the first three chapters, but ended up toning it down to Normal since it was so difficult.  My friends and I had fun with this campaign, but our enthusiasm started fizzling during the Trevor event, which was ridiculous.  Overrated, but still enjoyable.