We sailed Prima in the Haven end of January and I have to agree that I probably won't sail this class again. It is sort of too bad that NCL is investing in more of this class. Cruising is never a bad experience, especially in the suite class. But Prima was disappointing in many ways that I don't think can really be fixed.
1) It is a "fair weather" ship - if you don't have warm weather or it is windy all those outdoor areas empty and everyone has to crowd into spaces not intended for that many people. Our itinerary should have been warm but we encountered rough/windy/thunderstormy days (missed one port entirely) and another day was so windy - it was whipping. On the last night we were surrounded by lightening all around the ship. So it was not a great place to be crowded inside on many days. I would never take this ship to any cold climate itineraries.
2) The small scattered venues were horribly crowded - no seating anytime we tried the Surfside grill, the Local and the Indulge Food Hall. Never even tried to get into the standing room only show venues (we did get reservations to see Donna Summers Show - the featured singers were really good, though the show was very loud).
3) On the fair weather days the noise from the outside deck 8 Ocean Boulevard pretty much was constant all the time which made our balcony not very enjoyable. The balconies above deck 8 all overlook the lounging and noisy crowd and you can't avoid it.There was noise from 100 people all talking at once and children screaming in the pools most of the time, so no relaxing on our balcony.
4) The layout of the ship was poor and finding things and actually getting there was a slow winding mess of crowds.
5) The dedicated Haven elevators were wonderful BUT this ship design overdid it with the number of Haven staterooms on many decks.The staff tried very hard but there are not enough of them for the size of the Haven. Bar service was often *very* slow all over the ship. Even the Haven bar was not stocked with many common things so the bartenders had to go to other bars to get certain things. There was no purpose to the Haven lounge area - which was all chopped up into small squares of seating with nothing to do - no snacks, nothing there. Concierge desk was often left unstaffed. I enjoyed the Haven on other class ships much more, especially as there was no Haven observation lounge like on the Bliss. Haven pool was pretty but small, and the hot tubs were not a big attraction with the poor and windy weather. We did end up eating at the Haven restaurant a lot just because the other venues were so crowded and the service was good there, as was the food. We did enjoy Cagney's and Palomar but didn't even use all of our offered specialty dinners because of crowding.
Overall, the bad luck of rough weather and the design of the ship just worked against a great experience on the Prima. So we are going back to the Bliss next time.