I have never been on a NCL cruise. but have been on Celebrity and DLC
The way the staff were treated
Do you mean they way they treated YOU, or the way the staff was treated by their bosses? Staff on the DCL ships seem to be treated well. Working on a cruise ship is never easy, they get cramped, shared quarters, and work long shifts, but that is par for the course.
Now as far as how they treat you. DLC staff is "old school" Disney service. How the the parks used to be. excellent, friendly, staff people (On Celebrity I only met one staff member who I though had a bad attitude,. the rest there were good as well)
No ship that I know of has a large pool. They are all tiny. You best bet is to find the adults only pool.
You may find some drunk people on DCL, but not likely. DCL does not offer an "all you can drink" package, and their drinks are no cheap. Plus many people are there with their kids, so they want to stay in controll so they can keep an eye on them.
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There are rules, and they are enforced. Its a balance between enforcing the rules and keeping guests happy. Disney does it well.
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I have done 3, 4 and 7 night cruises with DCL - the buffets will have a lot of the same stuff day to day, but the main dining rooms will have different offereing for lunch and dinner. Breakfast rarely changes.
DCL is a very nice experience, but I have to say, having cruised both Celebrity and DLC, while I do think some aspects of DCL are better, overall Celebrity is a much better value, with nothing at all to complain about.
-dave