Sure, if you hate the writing style and explain that, that's fair. The problem is if you assume what the rest of the content, that you didn't read, is about. Su

Sure, if you hate the writing style and explain that, that's fair. The problem is if you assume what the rest of the content, that you didn't read, is about. Suppose you picked up the novel Jane Eyre not knowing anything about it, and gave up after the first chapter because you thought it was just a book about children and that didn't appeal to you. That's fine, but then don't leave a review assuming the whole book is about children. You didn't read the book, you read a tiny subset, so you're not qualified to review all of its content. But you could certainly say, "I read the first chapter and hated the writing style."