The Regatta is a comparatively small ship and has both the pluses and minuses that you would expect. The minuses are the small staterooms (we were in "Concierge" class which is supposedly somewhat of a premium category) with only a small loveseat and no other chair. We took one of the chairs from the very small verandah and brought it inside...crowded but at least a place for two to sit. The other primary minus is the Oceania gouging on prices. They put an outrageious 18% charge on all drinks, soft or hard and their prices are high for even a cruise line. Converting ounces to metric. a .75ml bottle of Jim Beam generates a little over $106 to Oceania, and that is their cheapest bar bourbon.
The pluses are numerous. First, the staff is uniformly great (and worth the $13.50/day/person gratuity). They are from all over the world, primarily eastern Europe. We enjoyed our contacts and they were many because of the "open" seating. The ships decor was warm and very tastefully done. Their library was extensive, most inviting, and was on the honor system...no checking out, just select and take.
Food was very good with their "upgrade" restuarants serving excellent specialty dishes...one a "surf and turf" menu and the other Italian oriented. Both menus were large and interesting. The main dining room had fewer of the speciality items but their menu was extensive and very good. Similarly with the "Tapas" buffet for breakfast and lunch, (and dinner if desired) and the Waves poolside grill.
The biggest surprise was the entertainment. My wife and I never thought too much of shows on other cruises but Oceania has been smart enough to hire a smaller numberof truly professional performers. After seeing one show, we made a point of going every night (except for the comedian).
All in all, except for the stateroom size we were very impressed and would consider cruising on Oceania again.