I went on the NCL Bliss to Alaska. The ship was really nice and modern. I sailed on the NCL Escape twice and the epic once.
Norwegian removed some classic features that other ships had. They got rid of the basketball/sports court, got rid of 4 holes of mini golf and made a small awkwardly placed mini golf course that appeared to be an after thought because it wasn't on the model in the observation lounge. They got rid of the bocce court.
They removed the ropes course and put in the go karts that aren't free unlike the ropes course on previous ships. They charge you $10 are ride and you have to book reservations in advance.