Ok, since I'm here now...I'll put in my 2 cents on this episode. :)
I actually really liked it. I know that at 41 I'm too old for Tumblr, but on Tumblr this ep has received many positive reviews...here, it is pretty mixed, it seems.
My hubby (who is a much more casual viewer than I although he was originally who introduced me to SPN) and I both got a big kick out of the Rowena/Gabriel antics. I guess we could just imagine the two of them doing that...fits their respective personalities, IMO. I also personally found the Gabe and Cas "personal space issue" scene pretty amusing- but that was I think because of their facial expressions. I thought this ep had a good mix of comedy, horror, drama, and action...although it was jarring how it jumped between all of those emotions- it didn't bother me all that much. This probably should go under UO, but I enjoy watching Lucifer. He uses annoyance as a defense mechanism when his power is low, and IMO that is a canon characteristic of him. Of course, I don't think anyone thought for one moment that the end of Sam would stick...but it didn't deter me from being glued to the sadness displayed by both Dean and Cas (and later Jack and Mary). Yes, sometimes the writing leaves something to be desired...but the acting on this show is superb. I'm a Producer IRL, so I've seen my fair share of bad acting...but this ain't it. All in all, I'd put this episode in my top 5 of the season...but then again, I probably unfairly weight Cas episodes higher.