I feel the Chuck going bad in the season finale was illogical and a bad idea. Chuck was willing to sacrifice himself to protect his creation in Season 11 and now he wants to destroy the world for not killing Jack? I was a fan of supernatural till season 5 but enjoyed watching the show until the season finale of season 14. Now I don't even feel like watching season 15 though it is the final one. They have made God the villain and it shows that the writers have clearly run out of options to whom to be made the villain. Now what does the Winchester do, they kill God? I was really surprised and sad to see the season end this way. If it is really Chuck and he is a villain, probably Supernatural is the most illogical series ever made and very sad way to end. Season 15 will be an adventure that I will not enjoy if chuck is really Chuck and he is the villain.
Honestly, they could have made the Entity from the empty a villain.