We took the Queen Mary 2 across from Southampton to New York in December 2013. Our package included 2 nights in New York as well as all flights and transfers: a really good deal. It certainly lived up to our expectations.
Check-in was well organised, given that they had over 2000 to check in in a very short time. Once on board we easily found our stateroom: a balcony on deck 11. A good size and well equipped, including toiletries, bathrobes, slippers, TV and safe. Plenty of storage space. Very clean and our cabin steward could not have been more helpful.
It takes a while to get used to where everything is but there is plenty to do on board: talks, entertainment, dances, a superb library and a not-to-be-missed planetarium. Or you can simply chill in one of the bars/cafes. There are also several swimming pools, but these were closed due to the bad weather.
Food was excellent with a choice of eateries. Personally I wouldn't bother with the Alternative Dining Options: the food in the Britannia restaurant was excellent.
There was a show and film every evening. If these were not to your taste then there were several bars, all with a different atmosphere for drinks.
We found the staff, without exception, to be friendly, helpful and efficient. It was like being on in a 5* hotel.
The crossing was very rough, with gale force winds and heavy seas for much of the time. However, the ship coped beautifully and it never felt really rough on board.
Disembarkation took a long time, mainly because of the US immigration procedures. Transfers to our hotel were well organised. Remember that when a ship arrives in a port, you cannot simply get off: the ship itself has to be cleared, before they can even think of disembarking the passengers.
However, please do your homework. This was a Transatlantic crossing and therefore different from a traditional cruise. If you are used to the more traditional cruises offered by lines such a Princess, Carnival, Celebrity, Silversea etc. then you may well be disappointed. We heard people complain they didn't like being on a ship for 7 nights with no stops!! Also heard people complain about the weather and the fact that we couldn't use the pools or go out on deck: it was the middle of December, what did they expect!!
An experience not to be missed.