Of course, going through the series and noting how it progresses is an interesting process. Once you get used to some characters...poof, they vanish. Other times the plot development that would seem best placed at the end of a book is smack dab in the middle of the book (of course in The Master and Margarita the two characters named in the title don't appear until the book is half way done).
There is something of a "Game of Thrones" problem here--not to compare what many regard as the pinnacle of science fiction to a throw away fantasy series.
But the problem is real.
You get to a section labeled "Tyrion" and you want to read it. Then you sigh and trudge through a section from the perspective of a less interesting character. That happens in these books. When certain character's story arc ends they are not always taken over by an equally interesting character.
One great thing about these books is how difficult plot summary is. You can give a BROAD summary but then it breaks down into smaller plots that sometimes stand on their own. There is something akin to a history book in these novels.
The next book will be interesting. It is the fourth book and one that came after a nearly 30 year lay off from writing this series. How will the tone change? The 50s were a lot different from the 80s!