Alright, so after watching the finale a few days ago and having had time to let everything sink in, my overall thoughts were a mix between 'hmmmm' and more 'hmmmm.'
A lot of you already brought up points that I had concerns with, but I'll bring them up again.
1.) Cas....what in the heck are the writers doing to this character? I was waiting for this 'big sacrifice.' I thought Cas was going to come to and be the 'ace up the sleeve' for the Bros. I thought we'd see once last glimpse of the S4 awesomeness that he once was, going down in a blaze of glory. But that's not what we got....that arguably upset me more than anything on the finale. I really thought we'd see once last rise to glory/redemption. Instead, we got more of the 'zen' Cas, who I'm not a fan of in the slightest. I understand he's screwed up in the head from Lucifer, etc. etc., but c'mon, let's fix it and move on.
2.) And speaking of the Devil....where was Lucifer? You can't have Sam tormented for almost an entire season and not address where or what Lucifer is up to. I was expected him to play a role in this finale believe it or not, but looks like I was wrong again.
3.) Bobby. I'm really glad they sent his character packing. I'm liked the 'realization' moment that the Bros. and Bobby had. Touching. My only complaint was that I wanted to see Bobby 'fade away' rather than just show a bright like, assuming we all know what happened. Seeing is believing and that's what I wanted to see.
4.) The Metallicar is back!!! w00t! That might have been my favorite moment in the entire finale, seeing that car hit the pavement once more. Such an awesome scene! The only thing that could have been better was seeing Dean behind the wheel once more, but hey, I'll take the car over no car.
5.) I really hope this isn't the last of Roman and Co. They were defeated too easy in my opinion, as menacing as they were. And now that Dean and Cas are in purgatory, hopefully, they'll have to readdress some Leviathan issues again, but something tells me that'll be the end of them sadly. Never say never I guess.
All in all, like I said earlier, the only thing I could say at the end of the finale was 'hmmmm' which may be my own way of saying that I was a little disappointed sadly. There were a lot of directions and aspects that they covered this season that I felt were unjustly addressed in the finale, which I think is why I felt the way I did. Overall, I'll continue to faithfully watch. It's still the only show on TV worth watching, IMO. And I look forward to seeing what they have in store for S8.