Goodreads will always win simply because it's where all the users are.

Like reddit or any huge site its usefulness isn't in the presented top layer (recommendations/front page/popular list of x) it's the depth of millions of users.

If you read a relatively obscure book and look it up on goodreads then you read through the reviews to find users who gave a high quality write up and then look at that user's profile. This will lead you to other users and books that are actual quality.

You could create a smaller website with a higher quality surface level but it's going to be infected with the bias of a small "elite" userbase making it a basically useless echo chamber.