Pros:

- A Portal Like feel to it
- Use gas cans for weapons and such
- Puzzles that require you to memorize
- An environment that is set to "Surprise" you
- Awesome laser hall way
- Awesome "scanner" to make you on fire
- One of the most adrenaline filled finale escape ever
- One campaign the survivors will never survive or escape

Cons:

- A single charger and tank hit on some high areas can pretty much destroy the entire team in versus mode. This can cause survivor players to rage quit as it's favored more on the infected side rather than on the survivors
- I had no idea you had to melee the paintings. Since there highlighted, your first instinct  is to "use" them. Once I figured that didn't work. I suspected that you would need to "use" them in a different manner. It wasn't until much later that I figured out you had to melee them. A little more of a clue could have helped out more
- The "spawn holes" makes it obvious where the infected can pop up at. In a well balanced group it can be easy to predict how the infected will come at you, IMO giving you a slight advantage because you know where they are going to spawn at
- Since it kinda has that portal feel to it. Having GLaDOS there would've been awesome

Conclusion:

I really like the idea where you would need gas cans to get some items and you could only choose between one of them. This tells the player that the gas cans are a valuable part to the entire campaign. The puzzles are introduced in a manner where you wouldn't get confused or lost on what to do. Then there re-introduced in different manners and intensify as you progress further into the campaign. The car dropping shaft, laser hallway and spinning room, are just some of the things that makes this campaign well worth playing. The finale gives you a rush that you never felt before, with the infected barreling you down and more of the puzzle returning back to back. Rushing to the exit, water slowing you down cars falling from the ceiling then when you think it's all over, BAM! Another keypad to enter. As you make the final sprint to the end, where yo see the world at the end of the tunnel. You get the biggest surprise ever, with IMO, the best ending ever in a custom Left 4 Dead campaign...