'You are reading this for the wrong reasons'.
The very first line in 'Endymion' the third part of Simmons spectacular Hyperion series. Reading the several negative reviews posted on Amazon and around the web by irate customers claiming this was not a satisfactory continuation of this story, you have to ask yourself how they missed the glaring warning from Simmons.
'If you are reading this because you are a fan of the old poet's Cantos and are obsessed with curiosity about what happened to the lives of the Hyperion pilgrims, you will be disappointed' he continues. Both of these quotes occur in the first two paragraphs. He's practically urging readers not to compare this part, to what went on before.
I found this approach rather refreshing. I found the characters likable and interesting (even the villains) and the planets brilliantly described. From the powerful Chitaktuk tribe surviving against Arctic Wraiths on a planet that's atmosphere is practically all ice, through to the nuclear wasteland that is now God's Grove. Each planet is detailed beautifully and enhances the overall story, immersing the reader in this remarkable universe. We visit many, many worlds throughout this books 400+ pages and given small glimpses into what became of each after the events of the Hyperion Cantos, as the story progresses.
That the story runs more like a movie, where our protagonists ( a convicted murderer and a blue android from Hyperion who are tasked with protecting a child who is destined to be the Messiah in the future) are chased by the formidable Pax, a religion that spans and exerts control over much of the universe with the use of resurrection through the Cruciform found in the tombs of Hyperion, but just who is controlling the Pax?. We're teased with revelations about the Technocore, Ousters and The Shrike which makes a strange Terminator-like appearence here(though there's still a great deal of ambiguity about this entity/thing and what its motives are) and indeed The Cruciform is discussed in great detail. The technological and scientific sides of things are suitably mind-boggling, yet quite believable, a must for any sci-fi tome.
While I agree both 'Hyperion' and 'Fall of Hyperion' are more enjoyable reads, 'Endymion' is a more than capable continuation of the series.