I don't understand how the same people who hang out around bookstores + make recommendations (which you classify as "good") aren't the same people on Goodreads writing reviews/making recommendations as users (which you recommend as bad?)
In a store the person has to go out of their way every time they recommend the same book. It's one-to-one vs. one-to-many. There's more of a chance they really do think highly of the book, maybe even years after reading it. That's valuable.
The recommendations you would get inside a bookstore have nothing to do with this kind of experience. You are having an actual conversation about what you like and are looking for.