Our first Oceania cruise and sadly our last. For the following reasons:
The Nautica did have good food, some of the best we've had on a cruise ship. The service was OK but it was very slow at several of our meals in the main dining room. I think they have trouble dealing with the surge that can occur when there are no set dining times.
The ship is very old and it didn't do well in slightly rough seas. On a couple of days the crew placed seasickness bags near all the elevators. Also due to the age of the ship the decor is very dated. The woods are very dark with dark colors throughout. It's a bit drab but well maintained.