I was expecting expecting it to be funnier...but I enjoyed it still, and the ending made me smile, i loved Chuck and it was nice to see him back. Is he back as God? Or as Chuck? Or was it just a treat for the fans?
While I really wanted them to go full on OMWF I think this was really fitting for the show. I thought it was funny, or at least I was laughing a lot. I really liked the director's reaction when Dean sums up the last few seasons for her. And all the jokes about fanfic and subtext and Adam still being dead. I'll probably rewatch it so I can get all the things I missed the first time around.
I hope Chuck is going to show up again either as Chuck or as "god".
I know that the show is about Sam and Dean and always has been and this was a celebration of their 200 episode journey, I felt a little sad that Cas (as in Misha) and Crowley weren't in it at all.