I have never watched Mad Men, never had any interest in it, but after reading about the final episode, that has to be the second-best ending of a television show ever, only surpassed by the epic end of Newhart. Third, in my opinion, would be the end of The Sopranos.
I love the fact that the show’s creator absolutely must have had the ending in mind from the beginning. That’s a first-rate lesson in doing storytelling right.
Somehow, I tend to doubt that A Game of Thrones will end anywhere nearly as well. While Benioff and Weiss have generally shown themselves to have much better storytelling instincts than George Martin, I’m still trying to figure out what on Earth is going on with Danerys inexplicably deciding to marry a member of the Mereen aristocracy. Fails as drama, fails as logic, and fails as being interesting.