Dont agree!

Right, some books may not be as helpful as other books, or even may mislead some people. However, just as the diversity in books, so as the individuals. As an old saying, one man's meat is another man's poison. Thus, you got to find a book/books or some guides suitable for youself. Then how to find? The most feasible way might be reading a lot of books. In addition, you may find only part of points in one book is suitable for you, while you may still find some useful in another book. No book is perfect, just as no person is perfect. On the other hand, no book is totally garbage. Otherwise, how could it get published and how could you read it? If somebody could write and publish such a book full of misleading information or whatever people hate. If any, he also could learn something helpful to himself after he finished a book as above.