Two can play this game. If anything has been hyperbolic, it's been the praised directed toward her. Just because the show is part of pop culture that hardly means it is of quality. Other scripted shows like The Big Bang Theory are enormously popular. Are we supposed to assume that the show is of quality just because a lot of people treat it as background noise?
I know I'm going to get crucified for this, but Tarantino is a writer who was stunted due to overwhelming praise. Pulp Fiction had critics proclaiming him as the savior of cinema and he was viewed as some sort of trailblazer. He's proceeded to go up in his own ass further and further sans Jackie Brown because of that.
Hey, I'll agree with you there. He's afraid to fail (probably because Jackie Brown was a "failure," despite it being one of his best) so he refuses to make anything that isn't a slight variation on his own formula for movies. I completely agree that Dunham (and really, any artist) needs time to grow, to experiment with their craft. I think there are plenty of writers/directors who evolve over time, even when they come out of the gate pretty strong, so maybe there's hope for Dunham. But it's obviously not going to happen if the critics are too busy shielding her from criticism rather than acknowledging some quite obvious truths about this season.