Don't care about length. Don't care for gossip / inside scoop. Don't enjoy single sided monologues or opinion pieces. Don't want to hear soap box opinions of the podcaster or humble bragging to prove they're an insider.
Get me a podcast where someone interviews people in the industry about any old thing past, present, or future, and I'll be hooked. Eg Mark Maron, This American Life. Multiple points of view, and constructive talk. A broadcast that connects the audience with the real culture and history and strengthens it all.