The QM2 itself is not friendly to single travelers, much less the attitude of the staff who are clearly trained for pairs of travelers. The dining room tables are mostly square or rectangular - not good for a singleton. Dinner aboard the ship should be a social occasion, and having the ability to converse with tablemates is critical. Fortunately I was able to find a set of good tablemates at a round table, although that took a couple of days. "Cunard-ival" has turned its back on the singleton. Ironically, when I wished to be seated alone for a meal other than dinner, I was actually told on board twice (not once, but twice) that the only way I could get a table for one at breakfast or lunch was to dine at the buffet. I did not pay my fare to schlep my tray like some high school student through a second-rate cafeteria.
My cabin (Category B3, Premium Balcony) was interesting. I am a tall person, standing about 6'2". The deckchairs were wedged in between the railing and the cabin bulkhead so that they were useless to someone my height. In order to sit in the deckchairs, I had to put my feet up on the glass panels or move the chair sideways on the balcony, thus rendering the use of the balcony door useless without moving the chair again. Even with the obstructed views of the ocean, I had expected the ability to enjoy breakfast on my balcony with the sea air, but was unable to do so.
I have alluded to dining earlier in this letter, but let me directly address the food. It was practically impossible to order off menu. The menus in the Britannia Restaurant were not at all coherent between courses. One passenger at my table likened the incongruent menus to rolling a cup of dice in the game of yhatzee. The portions were small and I always left dinner hungry - because of course there was no time to eat a second meal since the late seating was waiting. Quite frankly, if this were a land-based restaurant, I would never return; however, I was trapped onboard a ship with few other dining options. Lotus was too heavy on the shellfish and seafood. To pay a service charge for the Carvery was ridiculous at the fare (read single supplement and cabin category) I paid. I did, however, have one good meal in two weeks aboard the ship - Todd English. One of the things missing on the QM2 is a nice middle-of-the-road dining option like the Caronia Restaurant aboard the QE2.
Cunard is trying to mass-market luxury with this ship, and it does not work. Unless you are willing to move into the Princess Grill categories, I would not recommend any cabin category above a B6.