Pros:

+Running from ground-shaking tanks in coop is fun.
+Knocking friends off the cliff in versus is more fun.
+Having an "end" in stage-based survival is truly creative and makes players have a purpose to go on(fastest time to finish maybe?).

Cons:

-After halftime in taank mutation, items are all gone, only laser exist, bug?
-Tanks still have 6000 hp instead of 1500 in versus, bug?
-Water still in purple chess (highest graphic setting)

Conclusion:

One maps, two layouts, three kinds of fun, reminding me of Valve. Extremely high replay value. If you can fix the versus bugs, this map will rock.

Pros:

+Reliving Bioshock world through vastly detailed environment.
+Items in Bioshock (vending machines, bathysphere) serve purpose in L4D2 world.
+Scattered Items throughout the map makes players explore.
+Restructure the tech tree.

Cons:

-Lack of hindering objects through map designation overly based on Arcadia makes defending easy and fps drops.
-Increasing number of zombies is not the only way to make thing more challenged.

Conclusion:

This is a great map. Few maps can shock me in aesthetic design, this one does. I play with humans, so difficulty is not an issue. Maybe the size of zombie is not an only way to increase difficulty, adding some spawning holes near useful vending machine makes player shifting their defending force to resource gathering. There's a lot of way. Your map is greatly appreciated. Keep up the good work.