The food and service in the main dining hall (Cosmopolitan) were top-notch. We didn't feel like we could be missing anything important at Blu (Aqua-class) or Luminae (Suite-class) -- whatever is happening in those fancier restaurants is by definition either redundant or wretched excess.
Our concierge-class balcony room (8173) was delightful. Service throughout the ship was excellent. We had a couple problems (e.g., cabin thermostat broke) that were dealt with quickly and professionally. And we had a great time overall.
Still, there were so many unforced errors that we'll try a different cruise line next time.
Beautiful and spacious; cabin steward Garfield kept everything immaculate. An adjoining door connects to 8175, which we asked to be unlocked, and that was a real convenience. The walls were so amazingly sound-proof that you had to say, "Come in!" pretty loudly or the person in the adjoining room could not hear you. Plenty of storage. The room is far to the aft, but no particular engine vibration was noted, nor any other noise from above or below. I saw both rust and peeling paint, but it did not impact our enjoyment of the cruise even slightly -- I can't fathom why people talk about this. NB: no electricity in the bathroom, so leave your water pick at home unless it is battery operated.