This is my 3rd time on the beautiful Oasis. I have also sailed on her sister ship the Allure.
As far as ships go, the Oasis is awesome. The Aqua Show and the Ice Show are fantastic. I think the Broadway show Cats the Musical is a poor choice for a cruise and not only was the theater not full but more than half of the guests left mid-show...not because the performers were not talented but because the show is just weird.
As far as my overall experience, let me just share that I am almost a "diamond plus" member for RCCL and I have been very loyal to their brand for almost 20 years. Not any more! I was appalled at the constant "nickel and diming". I knew in advance that for the four cabins I was paying for (3 central park balconies and one junior suite) that with the alcohol package, specialty dining, excursions etc. that I would be paying just about $20,000.00 for the cruise. Little did I know that where popcorn used to be free, they now charge your $2.50 (plus 18% service fee) for a tiny little bag. Room service used to be free - now $7.95 plus the 18% service fee. My spin class had a $20 charge but then they added the 18% service fee (and the instructor was horrible - didn't even stretch us at the end of class. When questioned about not stretching he said that in "boot camp" - which also has a surcharge, they will stretch me!!!). When have any of you ever paid your aerobics instructor a tip? Toooooo Much! Cupcake class - surcharge, sushi class - surcharge, tour of the kitchen (used to be free) - now $30 plus 18%, craft workshop - surcharge, card making - surcharge, body sculpt - surcharge, spin class - surcharge, yoga - surcharge, wine tasting - surcharge - even with the alcohol package!!!!
Cabin was fantastic. TONS of storage. Walk in closet. Bathtub.