Honestly ratings from reviews should just be "would you recommended reading this book y/n?" at least until people learn how to write reviews subjectively and about the actual content not something unrelated such as shipping issues. We all vote far too inconsistently as a whole for more granular ratings to mean a damn thing might as well reduce that down.

I do like your point, but do believe we need far more criteria to make sense of these reviews. Yes we should remove the fluff reviews of users who wouldn't have liked the genre to begin with, but why stop there? There's so many variables that need to be considered where typical genre is one, but what about a person's intellect? If they disliked a book because they simply could not understand it from any angle would that apply to myself or any one of us? How would someone convey that in a review? How likely are these individuals to be that self aware? We can move to other areas too like political affiliation, one's culture, ones preferences in life in general or their experiences. The list goes on. While I do think removing the low hanging fruit such as "I hate romance but I read this because of a book club and yep I hated it" or review bombs or whatever else that isn't actually an issue with the book itself. Determining this sentiment without a significant amount of false positives would be rather difficult, and at what point do we consider a person to be a fan enough of a genre? What about new people to resding or a new account?

Randomly throwing a number of stars at something has always been surface level. I like your idea tho.