No doubt the Oasis is a marvel of ship construction. She is very beautiful and all the new areas of the ship are quite nice. However, beyond the wow factor of the nice ship, we were very disappointed because the BIG things that make cruising special were just not there for us.
We have cruised for many years with our whole family and are Platinum cruisers with RCL - which is our favorite cruise line. We will likely never cruise again on the Oasis class of ship due to the weakness we saw on this cruise. In general there is a lot of space on big ship, and usually do not feel crowded, but there are choke points like elevators at dinner and at port time, which were unbearable. Like Disney at most crowded times.
Customer service - we found that all areas of customer service were lacking. This is one area RCL has always excelled at. We think it is probably due to the huge number of people on this ship. The ship is big, but the number of folks in guest relations and other areas seem the same as other ships. That ratio just does not work. Guest relations was not polite and seemed to have the attitude of "what the heck do you want" when you stepped up to ask them something. Other areas were same - photo services when trying to purchase, excursion help, and various host positions.
Food - mediocre at best. We ate in many areas and the only meal I really felt was better than average was in the Solarium Bistro. Oh and Johnny Rockets was a great burger as always. Chops steak was no better than any chain steak house (nothing like we had experienced on other RCL Chops visits). Windjammer food never changed - we are used to it being different each day - and it was sub-par. They did not have burgers/dogs available throughout day as other RCL ships have. The dining room food was just not that good - not a single meal. Our servers were trying hard and they provided the best service they could, but they were sprinting to cover all the tables they covered and the food flow was terrible - waiting long times between each course. Again, I think they have hit the wall on how many people they can serve. Mass producing 4000+ decent meals just does not work. Room service - several times to our three cabins - was wrong and/or cold.
Musicians - We always enjoy the good musicians that RCL has in the Schooner Bar (piano) and the English Pub (acoustic guitar). The Piano guy (Henry Saxby from Australia) was fantastic - as good as any we have seen. He was a true entertainer. However, the guitar guy (Steve Christie), who played in the Globe & Atlas pub was a joke! Seriously, he was like a cheap karaoke machine, strumming chords along with his laptop synthesizer. Literally NO ONE was inside that pub after first night he played. The waiters even commented how they were not happy because no one was coming inside pub so they were not getting tips. Everyone sat outside just watching promenade - but no one wanted to hear this guy play cheezy 70s ballads. People was "sing along" guitar players who can play requests and really sing/play. I requested a song - "Can you play Brown Eyed Girl" - he yelled back "Maybe" and went on with his crappy setlist. Completely amazing. RCL could find 1000s of good guitar guys anywhere in the country who would love a gig like this. This guy belongs playing in a bingo hall or nursing home. Whoever hires/fires musicians needs to can this guy and get someone who is a talented musician.
Shows - the water show was pretty cool with all the diving, definitely a unique cruise show. Headliner show - ABBACADABRA - weak. "Come Fly with Me" production show was about what we expect from a cruise show. Past 7 day cruises always had at least 4 decent shows on RCL, so they have shortchanged here.
I do not blame the "ground crew" - the restaurant wait staff, the cabin stewards, the bar tenders, and the pool staff. They all did a great job. But the management and customer service on the ship were lacking.