[o11c]

There certainly are review-bombing campaigns, which can be known with certainty when caught at the same time and from the same source as review-boosting campaigns.

Most bad reviews are well-deserved, even if they make the author feel bad. In particular, "people shouldn't downvote if they've only read 5 chapters" is an invalid complaint - as an author, your duty is to write a strong start! (I suspect some of these are actually tagging/description failures, but that's also the author's responsibility)