Pros:

Very original
The most fun I've had on L4D2 in a long time

Cons:

None

Conclusion:

Ok, so when you first play it's a little unclear what to do/how to use researched items. Once you realise this then the fun begins. Excellent game mode, particularly when playing with a team. It needs strategy methods completely alien to L4D but are a breath of fresh air.

Pros:

Deck design.
Grand staircase design.

Cons:

Bland, repetative and sometimes copy and pasted internal environments.
Lack of health kits.
Too mazey
Static looking water
No iceburg
Finale was far too easy.

Conclusion:

This map had a lot of potential but didn't live up to it in my opinion. Most of the challenge was in not getting lost in a corridor that looks exactly like the previous 30 corridors and surviving with almost no health kits that i could find. I always think that L4D campaings where the challenege is to try to not get lost are by far the least fun to play.

I also think the finale was under-cooked. Maybe a passing iceburg and rising water levels would have been better. Without that this could be any ship from the time with the addition of the Titanic's grand staircase.