Our party of four sailed on Oceania's Nautica in May 2019, leaving Barcelona onto Lisboa, with a southern dip to the Canary Islands. Spent additional four days in Lisboa and the surrounding area. The cruise itinerary was terrific, the main reason we chose.
Alas, the ship is a tub, well past its prime. Built in 2000, this almost two decade boat shows its age. Cabin furnishings are tattered. TV is tiny. WiFi didn't work and when it did you were limited to one device per cabin, and it was dicey to change devices without losing the WiFi. Ships colors are dull and lifeless. Casino has perhaps 10 slot machines, some out of order. Our Veranda chairs had to be replaced due to stains. Concierge class offers nothing over standard Veranda cabins (brochure highlights of Concierge benefits only apply to Oceania's larger ships...bait and switch). Food in main dining room average.
For the premium price Oceania charges the experience is vastly overrated. jWE cruised on Oceania 7 years ago and found everything to be classy. Something has happened to lower their standards.