Messiah is less of a sequel, and more like the fourth installment following the three-part series of its predecessor. It really doesn't—couldn't—stand on its own, just like any of the three parts in the first novel would feel unsatisfying as standalones.

The universe of Messiah feels smaller, tighter, more claustrophobic than the first. Characters that could have been much more compelling are given little development. Its world feels small, which is unfortunate, because the first book felt so massive and complex by comparison.

Still it's a fun ride, and a worthwhile companion to the first book. The story feels fall from over, though the tale of Muad'Dib may have concluded here. Other reviews mention that it's a necessary if somewhat underwhelming "bridge" to the third book, so I'm still looking forward to the next installment.