Originally posted by princeton12321
I agree with the above poster that QM2 is overengineered for what she does, both in machinery and size. Especially considering she doesn't do 6 day crossings anymore. That accounts for some of why she feels more spacious. But the biggest reason is that she was never built to go through the Panama Canal like Viking ships and pretty much all other cruise ships were. This means she's considerably wider than virtually any other ship you sail on. It has a lot to do with how she "feels" inside.
I would say the QM2 is engineered to perfection for her role as an Atlantic liner, whether doing it in 6 days or 7. The extra size allows the diversity of venues needed to keep passengers occupied over 7 days with no port stops, provides extra stability for comfort, and makes her better able to deal with harsh weather. Her power plant is probably the closest thing to a design flaw (if 6 days is taken to be the target crossing time) but it has been explained why the GTs were used as a trade off (use up less internal space for ducting) and on 7 day crossings it provides a plentiful backup of reserve speed should the need arise for time to be made up. Even by the time QM2 was being designed and built there were quite a few cruise ships beginning to be built post-Panamax, and QM2 is now of reasonably average beam (cruise ships tend to be shorter and wider, so similarly sized vessels will often have greater beams).