Goodreads is perhaps the best example of enshittification imo. It’s only good now as a way to track your reading lists.
I tried bookwyrm today and it feels quite polished already, like giving you a guided tour of it’s features. Hopefully it takes off as well similar to mastodon and lemmy.
Once upon a time it held a lot promise for book recommendations. You wouldn’t simply look for books that had high star ratings, you’d be shown books that other people who had the same profile of likes/dislikes had enjoyed. They had all the data necessary to build an awesome recommendation engine.