Of course they are beautiful. And it's impressive to see a dozen female and half dozen pollen-covered males nectaring on one hibiscus plant.
That said, scientifically, they're not so interesting. Virtually all Ornithoptera are lowland (yes, I know not all), and most readily come to ground to nectar in the morning. And while each ssp is often restricted to a single island / chain, they are usually abundant.
I contrast Ornithoptera with Delias. I personally do not care for the colors of Delias, so cosmetically they have never held my interest. But I read everything I can about them, because they are so unique, distinctive in habitat, and offer a great opportunity for new discoveries.
Beauty does not always equate to interesting. From a retail collector's position surely they are beautiful. I find victoriae to be far more beautiful than alexandrae, but that's subjective. On the priamus-types, what I find most interesting is indeed the morphology, but as reflecting divergence- who the $**@ would have ever dreamed up an orange priamus-type? Green, blue, grey, those I understand. But orange? That there is such extreme color variation within the group is astonishing. And makes for a nice display.