I was a big fan of this show when it first came on. I thought the first season was very good. But it eventually wore out its welcome with me, because it began to seem like an exercise in congratulatory fart smelling by Matthew Weeener. I remember the exact episode (though not the season) when I knew that it had jumped the shark: Peggy and some writer were sitting outside of a shoot location, and they began playing off the old soap opera tagline "John... Marcia... John... Marcia". That told me that this was a show that had become a shaggy dog tale. It would go on & on, until finally many people would just want it to end. I think that was two seasons ago for me.
I watched the finale, just because I had once upon a time been a fan. But I was not impressed at all - though I didn't expect to be. Compared to (truly) great shows like The Wire and Breaking Bad, I just saw this show as over-hyped and over rated. I think its greatness was based largely on the Hollyweird pseudo-intellectuals telling everybody, and each other, how great it was. Like I said, Weeener would fart, and the Hollyweirds would Ooooo and Ahhhhh and give him an Emmy.
Sorry to be a Debbie Downer. But I'm glad that it's over and done with.