For all ages. It doesn't ask the best value, it asks for best family attraction. Not a family with only teenagers, but maybe with little kids? A Family.
The best value is going free to the beach, but if PCC was free, you can bet that I would go every time I went to Hawaii. The show was fantastic IMO, and who doesn't like a Hawaiian buffet? Is it still the #1 tourist attraction on the islands? If so, it isn't much of a reach. And why not support a good cause.
Of course, if you have no interest in other cultures or similar, I could see how you would be bored. Not as bored as little kids at Pearl Harbor though. I would never go to Hawaii to just go to the beach. Too many great beaches around the world that are much closer to me, less expensive to visit and much less crowded...There are many experiences as an adult that I would pick over PCC, particularly on other islands, but a family with little kids? Nothing better IMO.
My recollection, and it has been years, is that the experience was very, very good.