That is the question, isn’t it? As a writer I need and want the reviews. As a reader, I almost always leave a review. Depending on how much I’m writing (or not writing!), I average reading a book a week. I have the genres I like. Mostly contemporary and romance, but I do read historical, biography, fantasy, science fiction, and pick-a-genre. I read for the story and sometimes the author. Tell me a good story, and I’ll read it. I very rarely read something I don’t like or won’t finish. When that happens, I don’t leave a review. Sounds like a cop out, but I can’t like everything. I don’t need to be negative. Doesn’t mean someone else doesn’t love it. I’m happy for that reader. So leave a review. If you didn’t like it, then you didn’t like it. If the story wasn’t your cup of tea, I don’t recommend being negative because you can. Like I said, we all can’t like all the same things. It’s what makes the world go round. Now, if you you saw grammar or other flaws, send a note to the author. Things get missed. No one is perfect.