I don't know if I'm the only one bothered by this or if others have the same sentiment, but the fact that any review and rating can just be removed by the author greatly annoys me.
I understand that there should maby be measures taken against troll reviews but just letting the author freely choose which review's to keep doesn't sound like a solution at all to me.
If you make the effort to read the majority of a novel that you do not enjoy, since it is for example casually sexist, has characters with the depth and personality of a brick, and is written with the grammar of a middle school english essay. Then you spend time and effort to share a detailed report containing your honest opinion towards about the novel, just to have it all be for naught, since it'll be deleted anyway.
Why even contain a review option anyway if the opinion you share does not mean anything in the first place.
The most painful thing for me to see though is that the most positively reviewed original novel's nowadays are often the most horrifically written pieces of literature since anything that gives you a clear picture of what is wrong with the novel is already gone, making finding a good novel way harder since the rating is already pretty worthless as an indicator.
So maby a report to be reviewed option should be available instead of enabling authors to delete reviews, so that troll reviews can be reported.