Tomoyuki I was being hasty writing "all these authors" in my previous comment, it was an unnecessary hyperbole. From you comments here, I even believe you to be very reasonable. And I do not know what novel you've written, so I do not know either how you treat reviews.
The discussion went in this direction because, from what I read, people are assuming THE_UNHOLY_ONE didn't write a decent review, even though he gave it 1-star. Look at the first reply to this thread. Immediate put down of any reason to post a 1-star review.
But knowing the reality, the fact that you left 1 star review, means that you most likely did it just to annoy the author, making you the bad person.
There are 5 ways in which you judge the novel, and if you can't find even a single possitive thing, then you wouldn't read so far to get invested enough to leave a review. Simple logic
This is why I pointed out that, by this logic, the same could be said about a 5-star review. If you can't find a single negative thing, then you probably weren't looking for it, and probably shouldn't be reviewing. I do not find this to be very sound logic. At least here on WN, where the large majority of readers are amateur reviewers, it doesn't seem to be good reasoning.
That's why a 1-star review saying "I don't like this, it's hard to read and/or follow" should be just a valid as a 5-star review saying "This is the best I've read, very funny/interesting story. Can't wait for more". Even more so for authors (not you..) who doesn't delete 5-star spam reviews, they shouldn't delete 1-star spam reviews either. All reviews, no matter the score, should be judged by the same standards by the author. Can't put low scoring reviews to a higher standard than high scoring.
All of this boils down to that the first reply in this thread should have said:
"Authors have the ability to delete any review, because Webnovel does not have the required manpower to moderate reviews themselves. Therefore, some authors delete spam reviews regardless of the star rating, while some authors delete low score reviews to maintain a fake high rating. This unfortunately won't change before a better system gets implemented by Webnovel."