This was the exact reason I stopped listening to NDT's Star Talk. Wayyy too many mediocre jokes, intros, outros, how's it goings, what's ups, wayyy too little science.
It is supposed to be like that. It is entertainment made for a broader audience. And it is also fairly "cheap" to make. If you want more science you can buy his books or watch cosmos (a new one is coming this year). Or you can "graduate" and go read more specific material. Someday someone might figure out how to make more specific content for a lot of people, but it mostly hasn't happened yet.