We cruised on Regatta (sister ship) a few years ago (Rio-Amazon-Miami) and had a very positive experience.
This cruise (Dubai-Capetown) was disappointing in comparison.
The ship is slightly aged, but kept in excellent condition.
We upgraded to concierge verandah cabin for this trip so were prepared for the level of accommodation; no complaints.
We're still not sure what "concierge service" means, though. The service was good but we didn't know what to expect above and beyond what we got on our previous cruise.
We found the food and service to be excellent, especially in Toscana. I have difficulty hearing in noisy environments, so after our first meal in the Grand Dining room, I learned to request seating just inside the entrance, away from the busy waiters' serving stations.
The entertainment was of average quality. A couple of the professionals were extremely talented; a couple were not. Some of the scheduled entertainers were no-shows or delayed due to travel or visa problems. One such delay resulted in an impromptu Passenger Talent Show: mildly entertaining but not what we hoped for.
The String quartet was excellent -- highly professional, and the ship's band was super talented.
The six young on-board performers were equally talented. They put on several very entertaining Broadway-type shows as well as separate performances. No disappointment there!
With a number of sea days, there were activities like bracelet-making, embroidery, bingo, and other parlour games -- not of interest to us.
Two "Enrichment" speakers helped fill in the days: one was well-informed and entertaining while the other was rather pedantic and didn't hold our interest.
Surprisingly, there were no "Destination" Speakers. Adequate information about upcoming ports was very lacking and very missed!
Activities (e.g., more and varied speakers) and more substantive entertainment would have helped the long sea days pass.
In retrospect, the cruise itinerary could have been better thought-out. One or two of the four stops in India could have been skipped, with the time added to other stops. Sailing for a day or two (or more?) just to spend a few hours in the next port, now seems like a waste of time.
For instance, we sailed west for about two days from Seychelles to Mombassa, then part of a day to Zanzibar, and then a day and a half back east to Nosy Be (Madagascar) where we anchored for only six hours!
In our case, Madagascar was of more interest than four stops in India. After an hour delay in tendering plus 40-minute boat rides to and from Nosy Komba to see lemurs (a couple hours) there was no time left to go ashore in Nosy Be or any other part of Madagascar! Very disappointing!
Being rather inexperienced with shore excursions, and concerned with being left behind if we were delayed returning to the ship, we opted for the security of booking through Oceania.
The excursions we chose (based on brief, sometimes inaccurate or misleading descriptions) were mostly disappointments. Expensive disappointments.
As an example, an excursion in Durban was described as "panoramic", which, to me, suggests there will be stops where photos of interesting places can be taken. The actual excursion was a half-hour drive to "Umhlanga Rocks" ( apparently not a natural formation, but a high-end residential community instead), another half-hour drive to "Ballito" (apparently a small beach town, popular with locals) where the guide disappeared to apparently look for restroom facilities, leaving us to wander on our own for 15 minutes, then another hour-long drive back to Durban, where we drove non-stop through the downtown area, trying to snap pictures of places like "...the Theatre, where they have plays...".
As another reviewer remarked, too many excursions are made up of too many people: the guides are often too far from most of the group to be heard clearly (both on the buses and on walks). And even guides in "third-world" excursions should understand not to let their charges get strung out for a hundred feet in unfamiliar narrow streets and pathways.
These examples reflect our (and others') experiences on a large percentage of our excursions. Assuming we ever do cruise with Oceania again, it's very unlikely we'll use their excursions.
Many people we met aboard (some had multiple Oceania cruises) were equally disappointed and expressed strong doubts about using Oceania again. The general opinion was that after Oceania was acquired by Norwegian, cost-cutting and short-term profit-taking have caused a noticeable reduction in the level of service.
Unfortunately, our many good experiences on this cruise (especially with the crew and staff members) were offset by the excursions and other disappointments; we don't expect to use Oceania in future.