It would take a lot for us to get back on another HAL cruise. I even have a letter from them full of apologies, upgrade and VIP offers and I'm not biting.
I refuse to sail RCI because of their childish liquor policies. We mainly look to Princess first, we have 9 cruises with them, 10th next month. I think their loyalty rewards are great. If something we want to do is not available on Princess we would look to Celebrity next.
We came close to booking Azamara for our anniversary trip but for $745 per diem for basically hanging around the Amalfi Coast for 6 days, we can do far better on land.
As much as we like the Princess rewards, it wouldn't stop us booking Celebrity, Oceania or Azamara for the right itinerary/time frame.