I’ve sailed on the QM2 three times, one transatlantic and 2 Canada New England.
the transatlantic was far more formal and especially so on the two Formal attire nights, tuxedos or dark suits and long gowns abound. I would imagine that this is partly due to no ports so passengers look forward to the evening events. I would think it’s a bit tricky packing formal wear if the TA is the first part of a longer European trip where the tux and gown will just take up space in baggage. Yes the menus are rotated, on the 12 night eastern seaboard cruise I didn’t see the same menu twice, we were in the Britannia club restaurant but I heard the MDR menu didn’t repeat either. Wonderful food. The onboard speakers were excellent as well as the production shows and yes it’s quite British however being Canadian with British heritage I found the conversations pleasant and familiar . I there are similarities between HAL and Cunard, traditions primarily, understated elegance and excellent service.
hope this helps