I don't even remember that one.
The two classic series endings are Newhart, where the whole series turns out to be a dream that the Bob Newhart of his other series had, and St. Elsewhere, where the whole series apparently turns out to be an autistic child's fantasy. The first was brilliant. The second awful.
I do remember the finale of Michael C. Hall's other series Six Feet Under, which showed how the characters in the series would live and die in the future on a time scale stretching far into the future. It was also very clever, but a little too dictatorial for the show's creators to assert their authority in that way.
The ending of The Sopranos was a classic let down, but it got people talking, which was probably the idea. I wasn't impressed by the ending of Man Men either, but I had a lot of problems with that show.
Oh yeah, Bob Newhart and the Dream! Funny.
Sorry to hear it about Mad Men because I think I am only three seasons in to that. Forget to keep watching.
Spoiler alert!!!
Dexter - you think the final scene is when he takes his boat out and has to dump his beloved sister where all his other victims ended up. The ship is so tossed in a storm, you don’t know if this, too, will be his end. Because you know this is the finale episode. Will they leave it ambiguous? The audience feels his tremendous pain. The storm symbolizes his whole life. Born into violence, trained to use it, look how he ends. Beautiful. Tragic.
But no. There is a new scene, sunny day in northwest America, loggers in earthmovers chopping down and moving tree trunks. Wait. Who is that red haired guy with a thick red beard, in the plaid shirt, moving logs?
Truly a NO THEY DID NOT moment. Ruined the series a bit because it was sooooo bad.