Said it before, I'll say it again: Supernatural hasn't been great since season 2 or good since season 4/5. It was pretty effective as a horror show about two smart mortals against the forces of darkness, but any horror angle really ended the moment the boys got angels on their team. Demons are largely insignificant, to say nothing of lesser creatures like vampires, werewolves, etc.
The past 6 seasons have been nothing but a study in ass pulls, retcons, and transparent oneupsmanship. It's trying way too hard to be the next Buffy/Angel in terms of a supernatural dramedy, but it will never come close to those shows.
It needed to stick to what it was good at IMO and that is provide scares and thrills on primetime network TV. It hasn't done that in ages.