We have sailed once on Oceania & have 2 more booked .
I must say we didnot have many problems but of course nothing in life is perfect.
I found the shore excursions to fine price was about the same as some other line we have been on. Destiation services definatly needs more training in customer service...they do try but...
Stolen property...simple don't put your camera, cell phones etc..in your checked luggage.
I have not sailed Crystal so cannot compare
If you are interested in flashy shows, set dining, big casinos, kids programs don't go on Oceania.
From what I have heard from other Oceania is not Crystal but close.
Unless you want to try a mass market line try Oceania you might like it.