We are spoiled by three cruises on the Riviera. Open seating and four specialty restaurants (at no additional charge), spacious standard rooms (larger than other fleets' suites) and exceptional suites...perhaps the largest at sea. I think all with walk-out verandas.
To a man and woman, exceptionally friendly and helpful service.
No kids programs, so usually no more than one or two teen-agers and only a handful of folks with strollers. A generally upscale-but-not snooty clientele.
The bathrooms are exceptional. Shower AND a bathtub (with shower) in each. Good storage...and exceptionally so in the penthouse suites. (Walk-in closets, huge bath, etc.)
I think the only ships with cooking classes (where YOU cook!) and an artists loft guided by an artist in residence. The cooking classes are exceptional (not free), the artists loft is free. This year, they have Graham Denison on board as the artist in residence, and he is simply superb. Worth a trip almost just to see him work, hear him talk about painting and art (a 25-year Disney artist), and work one-on-one with people as they bring their ideas to canvas (often for the first time.)
Hard pressed to find a better traveling experience.