The problem with Hyperion is that it was so successful, the author couldn't resist the temptation to write sequels, and those are of much lesser quality.
Opinion of course, but I couldn’t agree less. Taken as a whole, I think the whole work is beautiful, and I re read all of them occasionally. The way it all spreads out and then ties together is wonderful.
Amusingly, within just a few hours of our exchange, Hyperion popped up in another comment thread[0], where my view on the sequels was reiterated by several other people.