We love Oceania. This past fall we did 45 days Barcelona to Miami, last year around Xmas we were on Regent for 30days. 1) We are not really drinkers - so if we have an occasional glass of wine it's on us. 2) We rarely do organized group tours - hate 'em! so we book our own way around 3) Oceania passengers seem to be more relaxed and less entitled (I knows that going to get me in trouble) but I find Oceania passengers less demanding and enjoying themselves 4) We always travel penthouse or above on Oceania and have never been dismissed by staff if there is an issue of any kind. 5) I found the selection and quality of food better than Regents. We were on O for 45days and the menu always rotated and always seemed new. 30days on Regent and the choices felt monotonous.
So, for us we love the casual feel of Oceania, the quality, and especially the price as we don't need to drink ourselves into oblivion, can walk on our own, and always book our own airfare. We also have a killer TA that gets us everything we want. !5 cruises on Oceania, 9 Regent, 3 Viking. 3 more 45+ days already booked with O, Riviera and Vista.