Comment by cgriswald
I've tried to avoid spoilers below, but there are some minor ones for anyone reading who has never read Dune Messiah.
I've read Dune at least a dozen times and followed up with Dune Messiah a few times. Sometimes I get that feeling of disjointedness. At its most extreme, Paul feels like a total stranger. (Stilgar might as well be a different characters; we see a changed character, but not the change.) Sometimes it feels like the books flows nicely despite the time jump. My best guess is that it depends on what aspects I've been most focused on while reading.
I'm reserving judgment as well, but one part is really stuck in my craw. Although I felt like Villeneuve's Chani was generally stronger I felt the last scene made her look like a child and my first thought was that it was a weak attempt to set up a particular relationship for Part 3.