I have cruised with Oceania before. The previous was last year on the Riviera, and I gave top marks for most areas that make cruise successful and worth the money. This time the whole cruise was poor. A small cabin, and a bathroom more or less unusable. The first bad sign was boarding at midday to find no table left in Horizons. Obviously the American passengers have special privileges. I cannot think of anything about the ship that warranted paying more per day for an Insignia concierge cabin, compared to a penthouse on the Riviera. At least the Horizon restaurant chefs on the Riviera knew how to cook. The Insignia awful for quality and selection. A total lack of dishes that would be akin to a 5* ship. No Alaska crab legs, no crab and no roast Suckling pig with a crispy skin al' la Riviera. The main dining room attempted the pig, but forgot to make it crispy. So the food was a no no.
The ports of call were a mixture of dead boring, Honfleur [Sunday in the rain], Portland, Milford Haven and Verdon chosen as drop off, or pick up ports for ship tours. The interesting ones were Bilbao, Concarneau and St. Malo. I will never sail again on the Renaissance class ships again, not only with Oceania but other cruise companies such as Azamara, unless I was in a suite.
I have had more space in a touring caravan than in the badly designed bathroom, or should I say shower room. Shower curtain/ on a 5* ship.