I really liked this episode - I am noticing how the Badham/Thompson episodes are always of a better quality than average. Also some really good acting here with Misha Collins as Lucifer and Jensen Ackles really doing an excellent job giving a subtle but perfect Dean involuntarily in love with Amara.
Thompson always writes the episodes in such a way that Sam and Dean become more human, more real. The scenes at the end, going to bed, Dean's inner turmoil, the music to that - there is a value to scenes like that, which build the carachter-viewer connection.
And there are a few funny moments in this one too. The whole Banchee story seems irrelevant to the big picture, and I certainly am not amongst those that are happy Eileen got added to the show regulars. If you are going to have a deaf carchter (usually to be PC), can't you find a beautiful,or at least charming deaf actress? Especially since this was developed into Sam's love interest, and later we are informed that Eileen is "hot". Sure, hot like Meryl Streep...