*Note, meta is not on actors or production, but kept soley on the writer’s room and showrunner.
So far, for me, there hasn’t been a stand-out episode. This year’s mytharc has been sadly represented, but as it stands, Sam and Dean decided not to close the Gates of Hell last season, but Sam’s dying anyway, so Dean allows an unknown angel to take possession of Sam and heal him, with the immediate implication that now Sam can be held hostage, and the angel Zeke can make Dean do whatever he wants - which includes casting Dean’s best friend and ally, the now human angel Castiel out of their home, the Men of Letters bunker.
The first half of the season has been MOTW episodes, leaving the mytharc on the backburner, random angels show up for single episodes, to be stabbed by Castiel or Dean, leaving us unengaged in the Angel war. Of the MOTW episodes, few have been truly scary, or showed us interesting monsters.