Honestly, down the road I think this will be a three-star book. For now, at this point where the literature stands for this specific topic, though, I think it's four stars. It's a good overview by practitioners at various points in their journey.
But, as an an example, there are places where people misinterpret some ideas, not out of maliciousness, just error, not having quite thought their point through enough. For example, while Chaos Engineering is a mode for thinking about a "population" and its overtly visible surface, and as such root-cause analysis isn't always appropriate, root-cause analysis is misinterpreted by some of the authors -- perhaps because they've been in blame-game cultures. Or they've been in cultures where people insist one root cause is the root of dysfunction in a complex system. Root-cause analysis is just part of systems-level thinking: given a set of conditions, how does this generate these behaviors? Where do those conditions come from? It's all about understanding the interbeing of a particular development environment. In particular, in understanding that, we can redefine the game being played to produce better results. Really, Chaos Engineering itself is only another way of changing the rules of play. So it makes sense for those in chaos engineering mode to view things from a certain perspective, but some authors lost track of the fact that it's only one mode.
It's also both good and bad that this is a book where the authors are still articulating how this discipline should work. On the one hand, it's great to see it in its raw, developing state. Eventually, though it'll become more codified -- that's why expect it'll be more a three-star book one day. There will eventually be a rendition of this topic that covers it in a more developed form, perhaps in five years. And perhaps written entirely by one person, as opposed to several, all with different levels of experience.
If you're interested in chaos engineering, though, I think this is something to read for sure.