Pros:

+Awesome building idea in sandbox.
+Mutigen idea is the best.
+The bases coming up were fun.
+Jimmy Gibbs Jr.!

Cons:

-Cant build high in sandbox (want to be in the tower with louis and survive)
-Building in sandbox is hard.
-Turrets attack nothing exept survivours (one killed francis in his tower).
-You can survive the base attacks with players by jumping on top of the tower of the command base (hiring, etc).

Conclusion:

These maps are fun to play, and challenging at the same time. I liked the idea of Jimmy Gibbs Jr. with his car, and the heli of helicopter dude was awesomesauce. I had a lot of fun with the mutagens in the base map.

I only want you to fix that building stuff, and that if you place it wrong, you can replace it and that the defencive props and all that stuff gets "welded" so you can build in heights too.

The building idea can also be found at a new (not yet released) map called "lets build another rocket" which has the same building stuff, but you can build towards the sky.

Conclusion: Very, very nice maps!

Pros:

-Levels are epic and hard.
-I like the weapon  buying system with the gascans.
-Laser room!
-Tank behind painting!
-Ending.

Cons:

-Ending.

Conclusion:

This... is... EPIC! I liked the keypad stuff things at doors, and when i was near end, I TOTALY FORGOT WHAT THE LAST KEYCODE WAS! Eventually i pressed some buttons and it opened. And that ending. When i came at the end, i had this sentance in my mind: "Why the hell, did i die, only o get to the beginning again!?!?!?!?!?!?!?".

In one word: Epiczorz.

Pros:

-Its Nacht der Untoten!
-Awesome to play on your own (friends only game on a LAN server)
-Random Box!

Cons:

-Not much medkits, but that doesnt get the review score down.

Conclusion:

This is a must play survival map. You can get the gold medal and its just like Nacht der Untoten,, only then in L4D2. Would be awesome if i could play it in L4D1 too, cuz then i could be playing this with my friend. He sadly only has L4D1.

Pros:

-You can get many achievements.
-Much fun.

Cons:

-Special infected can come in achievement area trough door to secret room.

Conclusion:

Its a very good map, you can get many achievements and its fun. Changed my review cuz i did get the achievement, only i didnt had the right weapon for it. I dont count the underground room thing, cuz the map is too awesome.