I think it's most useful for discovering new reads, especially with the advanced search and recommendations functionality. I do agree i could do a better job of non spoiler summaries. good idea

- Series have always been a problem. Some book lists will include the entire series, and then some will have individual books. If the series is sold as a single book I'll often just include that. Like Lord of the Rings. Sometimes I will include only the first book in the series on a list, to prevent always adding every single book in a series when a list mentions "harry potter series".

basically I don't have a perfect way of handling series'

for the last point, kind of. If you add a book to the default "My Favorite Books" user list, it gets aggregated and used for this book list which is included in the rankings. https://thegreatestbooks.org/lists/463