Our demographics: Mid thirties, no kids and fairly well traveled. Cruised with two other couples in same situation. Have cruised in that past about 7 other times. Passenger feedback on our cruise was anything from "vacation of a lifetime" to "worst experience of our lives." Take the feedback for what it's worth as your expectations will have a lot to do with whether or not you enjoy yourself.
As most have mentioned in prior reviews, the embarkation process leaves much to be desired. There is however, a good reason to arrive early as they have an "early arrival check in counter" set up inside the Queen Mary building. As it gets closer to actual embarkation time, they move this staff to the Carnival terminal. If you do not check in early, you will have to wait in a separate line to go through the check in process inside. Arrive by noon and plan to wait on line for about 90 minutes, assuming there are no delays with the prior sailing's disembarkation. All three of the couples traveling had all luggage in front of our state rooms by the time we arrived. Carnival needs to take some lessons from other cruise lines on this process.
Cabins are typical size for outside with balcony. Layout was well done and they managed to make great use of space for storage. Balcony door swings instead of slides so the prior suggestion to bring a bungee cord was a lifesaver. It will be nearly impossible to leave your door open without one. Bathroom was also well laid out and the shower was one of the larger we have experienced in this class of service. The water pressure and shower head were by far the best we have ever experienced on the seas. Promotional basket of toiletries was a nice touch.