I liked my first few cruises on Oceania ships, Marina and Riviera. I think that it was because Oceania was still trying to establish itself in a competitive industry then but it is not the case anymore :(.
My last cruise did not go well: service went down the hill across the board - too many untrained rookies. At the French restaurant a waiter made a mistake ordering a wrong entree. He agreed to bring a correct entree only if I would first eat a wrong one - amazing! Another waiter there strongly insisted that I absolutely have to order a desert. I promptly canceled my second reservation at this specialty restaurant.
Reception desk service was spotty and heavily depended on who was working there at a time. After a few unpleasant dealings with a particular employee, I would wait longer in line just to avoid her.