Sometimes an author who is normally really good produces something that is really bad. If I didn't like a book I will say so. I'm not going to like a book I won't bother to review it. It isn't fair on the author. Yes, if they are good enough.
Electronic publishing is very cheap and easy.
As a consequence the is a vast amount of material out there, most of it self-published and not very good. If some of that is published as e-books, all well and good. But if you are publishing electronically because you can't get accepted by a print publisher there may be a good reason for those rejections. There are some books that I know I won't like. For example, I do not enjoy books that are just war stories set in space, and I get bored by books that put detailed scientific explanations ahead of good plots.