I have done one cruise before with Disney and travelled with 3 friends, one couple who cruise often on Explorer of the Seas, and one complete newbie.
Embarkation was a breeze, although our email we received days before said to show up between 14:30 - 15:30. We left our AirBnB in Barcelona at maybe 10:15, and were at the port shortly after. We snuck in with our friends who were in a junior suite although we were only in a CP View cabin and were given group one and told it would be a 45 minute wait or so for boarding to commence. But we were happy to have group 1. However maybe 10 minutes later they started calling group 1. By the time we made it to the elevator to the gangway they were already saying group 1-25!!! So really fast boarding. I am a complete newbie to the Oasis Class, but I did get a feeling the cruise wasn't by any means sold out though. Which would make sense at the end of the Summer season like this.
The ship was impressive and lived up to the hype of the Oasis class. One thing I had read online and also that my friends who cruise on other ships also noticed along with myself is that the ship really is very interior focused, and even the few spaces on the main decks that do have windows/portholes for some reason have frosted or vinyl'd over glass. You could easily go a day on this ship and maybe only see the water once or twice.
Even though the ship was two weeks away from a major dry dock and her amplification, she was in pretty good condition. Only a few niggles with the lifts sometimes not responding to button pushes. We did a few finger wipes in nooks and crannies in public areas and every-time were impressed with the cleanliness.
Our cabin was fine for the two of us, although other than speaking with our steward(ess) about having our beds separated the first night, we did not really interact with her again.
Dining was average in the main dining room if I am honest. It wasn't to Disney standards, and my Carbonara one night was particularly congealed which was disappointing. The wait team in the MDR were brilliant though. We also did Izumi which was great. And 150 Central Park, where the food was good, but the atmosphere and staff were a little lacking.
Entertainment wise the main shows were great. Cats was a great production, but I do not understand why RCI thought this would be a good fit for the casual audience of a cruise ship. Many people left before the show even made it to the end of act 1, and even less came back. The Ice show was also great. Come fly with me made zero sense, but the cast were great. One night we ended up really enjoying which we hadn't expected to was the 70's party night in the Promenade. It just clicked and the place really came alive and everyone seemed to have a great time.
Overall the service could be a bit lacking and maybe this is because the crew knew it was the end of the season and they have one more cruise after ours then a long dry dock. But that is really no excuse, in particular every time I used the Solarium Bar, I was served by the same server who seemed very unfriendly and uninterested.
Shore excursions we did just one official RCI one which was Aix on your own, so it was really a commentated coach ride in and then we did our own thing (in the pouring rain sadly). Majorca was a great stop, although quick. but for me Cinque Terre at La Spezia was a highlight, stunning scenery and a great walk between two of the towns. Naples was foul, we took a train to Pompeii, but if I did another cruise that stopped in Naples, I would stay on the ship.
Overall it was a good introduction to RCI, and great to be able to brag at having done one of the largest ships in the world, and the first of the famous Oasis class.
Actually nice and spacious for the two of us sharing with bed separated. Could get a little stuffy, but loved the little seat beneath the window into Central Park. Fairly close to forward lift lobby.
A quick Day on this cruise. All Aboard was 4pm!
Do Cinque Terre if you can, stunning, and some great walks/hiking to be had.