By reading the first 2 toms I had the impression of reading a collection of stories with no connection between them. Some stories are written in a magnificent and wonderful way - Rachel & Sol, the priest Lenar Hoyt, Brawne Lamia, but others such as Kassad, MArtin Silenius, Het Masteen are longer and less catchy (in all cases I got bored reading them). But all the stories intersect in the end.
Anyway I found these first 2 volumes of uneven content. And I have not hung at all on the following 2 toms - the fall of hyperion 1 & 2. But everything must be read to understand the link between every character.
However, I loved and truly devoured the last 4 volumes of Endymion. And the books of Hyperion cantos then take all their magnitude.
Dan Simmons has created in these 8 pounds a unique and rich universe, and is based on a very interesting reflection on the intelligence and artificial life.
If you start the story, I suggest you go to the end, you will have big surprises (we find some protagonists Hyperion).
I put 4 stars for all the books, because the first toms really take relief in all the books.
In short, a reading series for fans of SF.