Gathering book reviews is hard. Now, digital versions can come with all kinds of ways to engage the reader and get one to write a review or at least ‘Like’ the volume.
Different story for printed books.
Here’s a fairly simple idea. Why not put a blank page at the end of a book, print a QR code on it and ask people to write the review by hand on that last page, snap the QR code and have that review submitted to publisher?
I guess automating what happens then is a big problem on its own. But for books that get few reviews, this could be a real game changer.