Pros:

Game mode.
Background music.
Decorate of the map.
Low gravity. 

Cons:

Tanks can make you fly to the water so easily.
Lag when there are a lot of zombies.
Camera goes crazy when you jump (because of low gravity). 

Conclusion:

In my opinion this is a very nice (and funny!) map.
I've played it with two friends and we had so much fun. I love this kind of games and seriously, I enjoyed this so much! It's a bit hard because there are a lot of waves, but that's ok; more challenges for you and your friends!
Totally worth the download.