We have just had two weeks on the Oceana. I read a lot of recent reviews and a lot are very similar ... Charming ship, a little tired, wonderful staff but overall an absolute fabulous holiday. Sure you get the regular moaning minnies who complain they cant find a table in the plaza straight away or their cabin is too noisy but if you book on the saver fare option meaning P & O allocate your cabin where they want you to go, you do risk being put under a noisy lounge.
What we take for granted is the very high standard of operation and services from P & O. Everybody knows their job and from the waiters to the room steward to the deck staff, they could all not be more helpful.
There is still a problem with people reserving sun loungers but until P & O really start removing items after the 20 mins they that they say they will, this will continue to happen.
Terrific cabin, quite a lot more expensive than standard balcony cabins but I think worth it.
Made our own way to Olympia. What a place, great!