That's a bummer. You mentioned California specifically and one of the things discussed in the book is how charter schools in California specifically were neuter

That's a bummer. You mentioned California specifically and one of the things discussed in the book is how charter schools in California specifically were neutered in important ways to basically remove their advantages; to remove what allowed charter schools to perform better anyway; to make them indistinguishable and therefore pointless. So it's no surprise any review of the performance of these specific schools would not be compelling. But deeper than that I think you've adopted an awfully defeatist and close-minded opinion. You don't have to keep yourself updated or read new things, but you must also then admit that your understanding is not sufficient, and that your opinion may be uneducated. No matter how much you read of any topic, there is always more to learn and new perspectives to be shared. Especially with such a new, live topic. I don't mean this meanly but it's certainly your loss. I hope you come around to open-mindedness again someday!