I've done a QM2 transatlantic crossing every year since 2006 and have seen a variety of changes, but the ship is still a true ship in every way.
Cabin: I always tend to book insides. Since the refit, these cabin appear brighter due to what I believe to be better bulbs ( compact fluorescent). The new carpets were actually very plush and though their style is rather unfitting, it grew on me over the voyage. Bathroom is standard, but has a good bit of functionality considering its size. I put in a recommendation to Cunard to restore the interactive TV, which I'll wait to see. Overall, a great place to end the day.
Dining: I enjoyed many meals, most being from the Britannia. It's a delightful well appointed room with great sea views, therefore good lighting. Many spaces on board are enormous and inviting. Having said that,King's Court, the buffet, was never a good place to hang around. I don't complain too much about it, but Cunard is long overdue for a decor refit, at least. I did sample two alternative dining venues ($10) La Piazza serving Italian and the Chef's Galley serving a classic, accessible French menu. Both were worth it! The pub was also a no-miss.Overall, dining was consistently delicious across all venues.
Easy to locate, near to stairwell B, not as noisy as some would think