IGN:
Well, it looks like the party is over. Let's jump right to the lack of the demon in the room. Sam loaded his brother up with human blood, and it looks like Demon Dean is gone. And that is not okay for so many reasons.
I keep thinking back to the title of the last episode. “Reichenbach” could reference Sherlock's faked death, and I'm hoping it means every event from Crowley handing over Dean to Sam to Dean becoming human again is a ruse. However, I can't rely on that because there was no “wink wink, nudge nudge” moment to the audience. All it would have taken is a quick flash of black on Dean's eyes after Castiel left the room or some kind of connection to Dean in the last mysterious scene (if that scene even has anything to do with Dean). Since we didn't get any kind of sign, we're left to assume that Dean is indeed human again.
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It was better than that but I can see where someone would give it a lower rating. I myself am too invested in these characters and I watch every week like I'm in the episode with them and so I think I care about the outcome a little more than some.