While I don’t think that it’s disputable that Marvel on Netflix has upped the ante on superheroes on television immensely that’s not for a moment to imply that there aren’t problems.
The biggest of which (in my eyes) is that no matter the series–Daredevil, Iron Fist, Jessica Jones or Luke Cage–they never seem to quite know how to end a season, which typically means you end up with more than a few episodes that feel either extraneous or even worse, like filler.
The Defenders in this regard was a bit leaner (if I recall, at only 10 episodes as opposed to the usual 13) and the series was the better for it.
Let’s hope the upcoming second season of Luke Cage learns the lesson.