The fact you find his guests interesting is in part due to Joe's success as a podcaster. He's able to get the best out of his guests by the way he questions them and keeps the conversation going. He doesn't pretend to be knowledgeable but knows enough about the topics to be able to prompt the guests for more info.

In saying that, I've stopped listening to him since he went onto Spotify. The only episode I've listened to in full since he switched was the recent Tarantino interview, which was great.