I've taken over 20 cruises usually of 21 night duration on Cunard, Celebrity, MSC, Holland America, Carnival and Royal Caribbean.Solo (single) traveller thus usually paying a 75-100% surcharge. For what it's worth I'm a gold level Cunard Club member.
I returned on 09 April 2017 from an unpleasant and unenjoyable 3 weeks on Queen Mary 2 - Hong Kong to Singapore sector of the QM2 world voyage.
I confidently booked this cruise having been delighted last year by a 21 night cruise on Queen Victoria from Cape Town to Southampton. The QV was sophisticated, gracious with passable food (buffet always better than dining room food), excellent speakers and entertainment and a stable compliment of sophisticated fellow passengers.
My 6th deck balcony cabin (6251) was relentlessly noisy from the promenade deck above and the laundrette across the corridor. Slamming deck, balcony and passenger doors ruined any chance of peace in my cabin or on the awful balcony. The sheltered balcony was so unpleasant with a 1,2m high balustrade and noisy that it was unusable other than letting fresh air into my cabin in-between noises from above and around my cabin. There was no view of the sea from inside the cabin. Rectification of some of the causes of my complaints took 2 weeks. Noises continued for the duration of the cruise.
Too expensive. Prefer independent sight seeing but almost impossible on this itinerary except for Singapore & Nagasaki. Shuttle transfers in other ports were 1-2.5 hours each way!