Be the voice of reason. Remember back in Paragraph One, you gave three reasons for your opinion?
If they don't have a book review section, start one. An op-ed is not an essay, something that unrolls slowly like a carpet, building momentum to some point or conclusion. Done right, your opinion essay will be an outstanding piece of writing. If you could change something, what would it be?
Just make sure it suits your writing personality and that you keep it consistent. Do you know how to write a book review? Can you identify any limitations?
Do you want to be a book reviewer? In an op-ed for either your blog or as a guest editorial in a newspaper, the rules are the same: You essentially state your conclusion first.