Pros:

-Good setup
-Good balances between safe houses
-Large maps
-Many good places to check out
Looking at VS mode
-Many good places to hide as an infected
-The forest arias have quite a bit of challenge against real people and not just bots

Cons:

-It seems no matter what level I choose to play at, there is always a huge zombie rush at the very beginning of the campaign
-Some of the AI zombies respawn to get stuck in very awkward situations (I saw one that respawned with a normal table cutting him in half against a wall, yet he was still trying to kill us. Another case of this was with a zombie that was stuck in a closet and there was a shelf that went through her neck).
-I know this isn't finished but, I feel like there isn't really a story right now (maybe it'll change when it's finished).

Conclusion:

This campaign is possably one of the tougher ones I've played. Very unique style of maps with a lot of challenges to offer between keeping your team mates safe, and making it to the next safe house (the challenge being mainly hordes of zombies, and the once in a while tank). These maps are great fun when you have friends working with you or playing against you. Over all, great maps and great setups but please work on the storyline. I can't wait to play this campeign when it's completed.