I think I'm sort o the same. But not in the sense of "missed potential," more in the sense of "a lot of room to explore and create." Like, Criminal Minds is set in our world. There isn't really much room for exploring outside of canon. The fandoms I've been into most have been Harry Potter and Tolkien because both of those have left a lot of room to explore (with Potter I think there is a lot of missed potential as well as a whole world to explore, with Tolkien it is just about getting into the characters heads and thinking about things that happen between canon bits and things like that because it is such a big world to explore).