So only people who have something good to say about the book are allowed?
No. Only those who have READ THE BOOK and are willing to discuss it are.
Of course not. But if you didn't like the book, why not form a cogent argument as to why it has zero virtues, in your opinion? I'll give you that it's long, and I'll admit that some of the "speeches" could be shortened, but that takes little away from some of the book's key messages.
You don't have to agree with me, or like the book. But surely, given your FR web page, there must be something in it that would appeal to you. Have you actually read the book?