Often the problem is bait and switch. For example, I went into the Witcher series expecting a show focused on Geralt, like in the games and books. Over the seasons it progressively devoted more screen time to Yennefer and Ciri, effectively making Geralt a side character in his own story. Now season 3 is sitting at a 19% audience score according to Rotten Tomatoes, viewership has cratered, the actor for Geralt (Henry Cavill) has left, and people are betting that it will be cancelled.