Pros:

Great detail. 
Didn't encounter any glitches.
 Keys and locked passageways gave a challenge but were not so hard as to be frustrating.
Liked the Half Life 2 feel.
 By the time we got to each safe room we had been through a real workout.

Cons:

It would be too long and challenging for most players.  Set aside 3 hours for your first time through.
Don't try it by yourself.

Conclusion:

The author went through a lot of work.  I like a good maze map.  This campaign will exhaust you.  It's a great challenge.  Very different from the follow the path campaign.  Thanks for all your hard work and imagination.