I listen to a lot of philosophy podcasts. Some I like and some I dislike. The ones I like are better. For example, one I like is called The Partially Examined Life.

I think a podcast is engaging when it's a. about a topic you are interested in and b. is presented in an interesting fashion. Obviously there's more to it than that but you get my drift.

Point b has a little more substance to it because there are many interesting ways to present certain topics. And if it's presented in a cool way, then perhaps you will be more encouraged to learn more about the topic.