Yes! Readerly (readerly.com) delivers on what Goodreads doesn't - it doesn't rely on the 5-star rating system and learns what you like to give you better recommendations. This means it's a social network that improves for users as it grows, it doesn't weaken as Goodreads does.
Have you seen https://www.readthistwice.com? (fyi, I'm the founder)
It seems odd that Amazon's recommendation engine isn't better. Perhaps it works for most people.