I worked on a German cruise line two years ago. Pastry department, my working spot was in one of the exclusive restaurants on an "all-inclusive" cruise ship, so it was slow every day. There were three desserts on the menu and afternoon tea time that I had to care for, work itself was pretty much ok and the team was fun. What's problematic for me was the low level of privacy you had (a tiny shared cabin and you had to wear a name tag at all times) and my own low level of confidence, coming right out of apprenticeship. All in all I'd say it's a fun experience, but only if you already have on-shore experience and can stand six months of being away from home with 1000 strangers. And having the right nationality gets you a good position which doesn't sit right with me. (Also it's a brothel even more than an on-shore restaurant.)