To a certain extent it's a problem I have with Game of Thrones, but more with shows like this season on Arrow, Oliver has had no real arc whereas the secondary characters have - especially coming of last season where the story arc was so strong. The season 2 of Orange is the New Black saw Piper basically removed from the foreground of the story entirely. The Walking Dead seems to hop scotch around this all the time, where Rick Grimes drives the plot until well... He's randomly not.
Ensemble cast storytelling is fine but I feel if the audience doesn't have a protagonist's story to drive the plot, the story and the plot become disconnected and you feel like you're watching two completely different movies/series.
My other pet peeve is M Nights Last Airbender... But I just f-ing hate that flick and will express any chance to tell the world.