Pros:

Fantastic design
suspensful, good looking
smart. simply smart
ending that sealed the deal
incredibly fun with a friend

Cons:

We were able to skip an area by using the "jump once, hold space to ignore ledge grabbing" but I really don't care. I loved every bit of this campaign.

Conclusion:

Fantastic campaign, my favorite so far, it makes you think and at points scares the living crap out of you.