I've cruised twice with NCL now, once on the Bliss, once on the Dawn. Both were an absolute pleasure thanks to the crew, and super friendly and engaging fellow passengers. I haven't seen any problems with drunk passengers, my guess is because people aren't trying to hit the drink limit like on Carnival and RCL, because there isn't one on NCL. + both cruises were a week or much longer so you'd have to pace yourself if you want to make it to the end of the journey, unlike the 2-5 night party cruises.