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I have cruised 3 times on Carnival (been there, done with that, bought the T-shirt). It's certainly the party boat for the young.
Twice with Norwegian. My experience on the Dawn was wonderful. Met at the door with a flute of champagne. Boy was I shocked to see Nickelodean greeting me the 2nd time. Enough with boats that have a slide on top.
Once on Royal Caribbean. Wonderful experience.
Once on Costa. It had the best dining experience. But nothing else.