I'm not the grandparent. But my opinion: Kingkiller Chronicles has a lot of fans (though fewer and fewer as time goes on), and I thought Name of the Wind was fine as a beginning to a potentially good story. But Wise Man's Fear was quite terrible. Your mileage may vary. People who like Rothfuss seem to like him for his prose, not plot. Another thing to consider is that Patrick Rothfuss is a giant asshole towards his fans. It has also been nearly 12 years since he published anything. He's basically made a career out of not publishing book three.
Thanks for the input! That's a good point you've made. Maybe I can just ignore the series until we have some indication that it'll actually be finished.