Pros:

+ Simple, yet mazelike, level design is great.
+ Smaller campaign makes for quick runs with friends who don't want to spend two hours playing.
+ Swamp looks better than Valve's.

Cons:

- Lack of ammo piles.
- Lack of melee weapons.
- Last map was short, so we wondered why it was even added.
- Breezy finale. 
- Infinite bile bombs at the finale.
- Had pretty much every tank spawn outside the game zone.

Conclusion:

I get that this is still a work in progress, but some issues are just... Too big to go unnoticed. This campaign has potential, but in it's current state it is too buggy for there to be an open beta. 

Good luck!

Pros:

Amazing recreation of horror settings
Mines of Moria felt like you were the Fellowship of the Ring
Much love for the Haunted Mansion
Easter Egg rooms (Like that terrifying room in the mansion)
Surprise endings are always fun
No known NAV issues,except with AI con

Cons:

No sniper rifles
AI loves setting off traps
Bad weapon selection
No Uncommon Infected (v_v)

Conclusion:

One of my favorite maps for L4D2. I never played the L4D1 version,but I'm sure it was just as awesome as this one! Even with those two cons,this is still a 100/100 for me. A must play map for everyone. It's loads of fun,and you feel like you're actually at these locations.