I sailed on the Norwegian Breakaway on 3/2-3/9 of this year. This was our first time cruising on Norwegian and will definitely be our last. Once we boarded our bags were not delivered to our room, however after hours of waiting for them, I finally went to guest services to find them sitting there for absolutely no reason whatsoever. When I asked why no one called our state room or why no one answered the line when I called guest services I was told that they were too busy.
The ship was sold out, and you just feel that you are another number. If any member of the crew has to go out of their way to help you, they don't even try to disguise their irritation.
The only person I felt deserved a tip was our houseman, so that's who we tipped.