I have not been on the POA - the only ncl ship I have yet to cruise on.
All I can say is the reviews have gotten much better since they reduced the number of ships in HI to one. The biggest problem in the past was keeping 3 ships fully staffed with quality US employees. Today they have a wait-list of crew and the service has dramatically improved. Still different with US workers then an international crew terrified to lose there jobs.
This cruise is all about HI and the only way to really see so much of it in 7 days.
If you get a chance stop by the front desk and introduce yourself to James Byrd he has been working with NCLA since the beginning and active poster on other boards, Twitter, facebook,You Tube, and his own blog.
we were on the PoA in April of last year. I too was prepared for the worst, but was delighted. I did a review of the trip,, so check that out. While the American crew makes the experience a bit different, it is still a great vacation. Relax, enjoy!