We have done two transatlantic cruises before on RCL Voyager which is much larger and much more stable. We experienced rough waters and the Legend rocked and swayed plus our cabin was just above the boarding bay and something in that kept banging all night and they seemed unable to fix the problem. Most of the common facilities were crowded and it was tough to reach our dining table because of the number of tables packed in the room. The smoke from the enlarged casino fogged into the schooner bar and made it very uncomfortable.
They also experienced some illness before the cruise started and delayed our access to our cabins for several hours while they purged the ship of all the linens and papers. Then AFTER the ship left the harbor they gave us a note about the illness and said if we wanted to reschedule we should contact an agent.
Their entertainment did not seem of the same quality as we experienced on Voyager. Perhaps on smaller ships they pay less.