We have sailed with Oceania on 4 previous occasions and always enjoyed it - good company, great food, excellent service - cabins are definitely small but we don't spend much time in our cabins.
BUT - this cruise was not up to our expectations, even though we did enjoy it... We believe the reason is the large number of RTW ers -they lacked the happiness and excitement, often shown by people on holiday - often they did not dress for dinner - men wore polo shirts, etc - and to us, the passengers resembled much more RC cruisers than Oceania cruisers! There were very few people who looked at all like those in their advertising material!
We found the bridge lecturer outstanding and the guest lectures interesting, and Ray the Cruise Director did an excellent job.