These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Badass Decay: The limits of the Shrike's power are explored in the second duology, where it faces creatures nearly as powerful as itself.
Crowning Moment of Heartwarming: The first book has quite a tender moment between all of the characters near the end. Each of them resolving to face the Shrike together.
In the second book, the ending is even more heartwarming. And more than a little bit of a tear jerker.
Even Better Sequel: The 3 other books in the Hyperion quadtrilogy - Fall of Hyperion, Endymion, and The Rise of Endymion are regarded by some readers as even better than the original novel. On the other hand, some consider the second pair to be substantially inferior to the first two. The überseries is really two two-part series, with the first dealing with a mystery and a large and diverse cast in a hyperfuture somewhere between cyberpunk and post-scarcity and the second dealing with the fairly direct exposition of that mystery, a much smaller cast, an obsessive focus on a romance (you'll never read the words 'My love' so often) and a setting most readers will probably find regressive from that from the first two novels, albeit with some interesting nightmare fuel technologies of its own. YMMV, but the two series are so different that it's unlikely any given reader will like both equally.
Fauxlosophic Narration: "The Void which Binds", etc. Aenea's "philosophical" lectures basically amount to this.
Genius Bonus: The series is littered with literary references, from overt to subtle.
Sesquipedalian Loquaciousness: Aenea's aforementioned lectures. The author draws heavily on the terminology of several sophisticated real-life philosophies and religions to present simplistic hippie nonsense as deep philosophy.