I write this from the perspective of a 47 year old cruiser who has sailed with Oceania 7 times. My cabin experience has always been a PH2 or PH3 on deck 10 or 11 on Riviera/Marina and deck 8 on the R Class ships. For reference and point of view purposes I have sailed on most major mass market lines. In recent years my taste has changed and strongly desire smaller ships with less passengers and a more inclusive experience where you are not nickel and dimed. Therefore, lines such as Oceania, Crystal, Seabourn, Azamara, Regent and Silversea have been strongly preferenced.
The condition of the Marina is tip top shape - especially for a ship built in 2011. Food remains outstanding. Cruising on Oceania is more akin to staying in a really nice floating hotel as opposed to a true cruising experience. Highlights not only include the dining room and specialty restaurants, but also tea time and the strings. I also believe Oceania and Regent have the best pool areas at sea.
Unfortunately, I feel strongly that Oceania has lost ground compared to the competition - so much so that we just booked our first Viking Ocean cruise as reviews seem to compare the two lines as apples to apples with Viking Ocean being the better apple. Unfortunately, Oceania's apple has become a bit rotten. Here's why: