You can't force creatives into a box. If you try, they'll no longer be creative. And no one will want your box.
? Reviews are for readers AND authors. It’s a good way of learning from what people think about the work. Being it good or bad. A book might as well be hurt by a bad, poorly written review. That’s such a pity. Some people don’t know how to express themselves, and maybe that’s why they are just readers and not writers, others read a book like chewing a cupcake. That’s too bad. If that was not your cup of tea, leave it there, untouched. Don’t go bash the author for that. But if you really hate the book, why bother telling others. It’s your problem after all. You can give constructive opinions but don’t blame the author for your different tastes and views. Also authors shouldn’t comment on reviews, it sounds unprofessional, even silly. Some busy writers don’t even have time to read what other people say about their work. If someone enjoyed your book, or not, that is irrelevant. If you will continue or not to write something else it doesn´t add to the plate.. Besides, why bother commenting on a review, just read it and shut up. Being it good or bad. So my opinions about authors commenting on reviews is just my opinions after all!
To be able to listen -- really, wholly passively, self-effacingly listen -- without presupposing, classifying, improving, controverting, evaluating, approving or disapproving, without dueling with what is being said, without rehearsing the rebuttal in advance, without free-associating to portions of what is being said so that succeeding portions are not heard at all -- such listening is rare.