How to Find Out if a Third of a Novel Is Good or Worth Completing

We have a problem sent in by a Darren who says they have written a third of a novel. They don't know if it's bad or worth completing, so how do they find out? Beck: Well, first of all, it's bad because it's not completed. It is still an incomplete novel. It's still bad. That's a personal choice, really. ...whether something is worth completing?"