TV series are fickle. One season of a show might be the greatest exploration of modern storytelling to hit the small screen. But its follow-up may be nothing more than one big, hot, flaming pile of garbage. (See “True Detective.”) Some series manage to push past the sophomore slump and stay great for years. But others just drag on. And there's no discernible end in sight. These are the TV shows that should be cancelled. Because they have way, way overstayed their welcome.