Well, the QM2 is a really great ship, combining traditional atlantic liners design with a modern cruise ship. At least, she is the last purpose-built north atlantic passenger ship - I'm quite sure she won't find a successor in the future.
The Queen V and Queen E are in my eyes nothing more than the ordinary "cruise boxes" with a black painted hull to make people believe they were boarding kind of a "classic" ship - this is nothing but eyewashing to me. Their design is standardized and called "Vista Class", 11 ships of that class are existing (you can read more about them here: http://en.wikipedia.org/wiki/Vista_class_cruise_ship
). I don't like the skyscraper-like, boxy design of most modern cruise ships, that is the reason why I love the elegant and racy liners of the past so much...
If I had the choice whether to sail on Oasis of the Seas or on Mauretania, I wouldn't hesitate to board "Maury" - even when I had no private bathroom or toilet and no 24 hours of party there. That's not my stuff, generally. But of course, this is a question of personal taste.
All the best,