Very nice! I obviously need to invest a bit more effort into rating books I've read, though.
Yes, sadly not many people keep track of their books on Goodreads and even less rate them. However we did add two methods to get recommendations by simply selecting one book you enjoyed. The first way uses all of the other user's ratings together with book features and the other simply finds all the most similar books to the one you selected (using description summary, tags, and genre)