The Regatta fell far short of Celebrity ships in terms of plush, impressive common areas, such as forums, restaurants, theatres, etc. The casino seemed to have little interest in serving customers. There were no tournaments for the guests and no $5 minimum blackjack tables. The chairs for video gambling were much too low for comfort. There were no production stage numbers, such as you get most every night on Celebrity, Princess, etc. The assistant cruise director said the clientele was so old, they couldn't stay up late enough to go to a show after dinner.
When we docked a distance away from town, there were no courtesy shuttles, which are commonplace on Celebrity cruises. The shore excursions were the most expensive we'd had of 18 cruises with other cruise lines and provided no services we hadn't been receiving at lower prices. The specialty restaurants had nice views, but were not special in terms of menu offerings. There was no option for assigned dining so that we could develop a relationship with the serving staff. We managed it on our own, but only by arriving at the main dining room as soon as it opened and requesting our "regular" table. The food was generally quite good, but inconsistent, and overall not better than on Celebrity. The staff was excellent, but they always are on Celebrity and Princess as well. The entertainment staff was the most dedicated that we've experienced.
We can't see the appeal of Oceania unless one really prefers small ships and fewer passengers, but we felt the ship would feel too small for us for days at sea. And all of this at MUCH more expense than on Celebrity and Princess!