Eh, I was let down. They were good episodes, but on a finale scale it wasn't gripping. Had its moments where they were going somewhere but dropped the ball. It did its job as a finale, however, by ending it off with questions for next season: How the **** are the gonna stop Castiel and what's going to happen to Sam now that he remembers Hell?
The mindwipe thing....eh. Not really a big fan of it for the simple fact that it came out of nowhere. Angels have always had the power to erase memories but why hasn't it been suggested as an idea on Sam? Why not just erase his memories of Hell?
Everything was there for the finale to make it strong, if they just went a little bit harder. They copped out by making Ben forget everything. It appears that they wanna get rid of Lisa and Ben, then why not just leave Lisa dead and Ben scarred? Sam's wall coming down was done beautifully, but I hate how it ended with him just coming to and not being a drooling mess like everyone theorized. If that was the case, they should have either left him in that state for the whole episode or have his wall come down at the last minute before Cas gives his "bow down" speech. Either of those would have been better, because they made us (or at least made me think) that Sam's memories from Hell were going to be real important like they would tie into the plot.
They forgot all about the monsters. I HOPE this is brought up in season 7. You've got all these monsters gearing up for war all season long and we hear nothing of it again once Eve's dead. So you mean to tell me they just said to Hell with our war? Eh. And I was definitely expecting something to come out of Purgatory with all the hype we been hearing about how dangerous it is to open the door, but this was good too because I definitely wasn't expecting Castiel to declare himself the new God.
But yeah, if they left everything alone, the finale would've been 10x better. Have Lisa die, leaving the door open to Ben maybe becoming a hunter. Have Sam's wall collapse at the very end for cliffhanger effect instead of him coming back together. That's about it I guess. The deaths didn't really shock me. They killed a character we only saw one time prior to the finale. And Balthazar will definitely not be missed.