Willie, you and JFL have made me think it over, and I still think the same, but I will elaborate a bit: "Mad Men" succeed in many ways in its first season: plot-wise, direction-wise, and also re the wonderful art direction and period detail. I won´t talk about the fantastic group of actors they made famous and capable to get other roles post-MM. But hey, this show lasted 7 seasons through 8 long years. In hindsight, I can´t say the storytelling was perfectly crafted: I loved and looked forward to watching the first 4 seasons, but when I watched Season 5, I realized that the show had lost something. Not going to get into the disappointing last episodes...
No, they don´t. Thank you anyway.
Suddenly a lot of plots were forced and others were left aside, and well, let´s say they pulled a Gabrielle when January Jones got pregnant and they made her wear a fat suit. She, the most classic beautiful actress of the show...! It didn´t work in "Desperate Housewives", nor in "Battlestar Galactica", nor in "MM" neither. Mini-shark jump. As usual, it was not one specific thing that caused the show lose some quality IMO, but a number of little things. I guess it didn´t help either that audiences seemed to be a little tired of the show, but it never was a matter of ratings with MM.
Take it easy Betty.
There are still 3 seasons left.
As I watched recently the superb "The Handmaid´s Tale", I heard myself saying: "How underused Elisabeth Moss was in the later seasons of MM, and how much better this series might have been if they had given her better scripts and storylines." And I think the same of the other actresses: Jones, Hendricks, and Paré had the same problem. Only Kiernan Shipka, who played Sally Draper, got better and better stories (and even reminded me of that old sassy Olivia Cunningham from "Knots"!).
How very Olivia from her.
At least she had that old fart Gary!
I also think that Jon Hamm, one of the most attractive and charismatic actors appeared in a show of this century, despite everything, is not as a good actor as they wanted us to believe. But his was the only character that kept himself up to the end. And, undeniably, the series and his character wouldn´t be the same without him.
Sorry for going off-topic, but back to the soapiness of MM: When you see that a quality show like that is going through cliche territory, then they must be doing something wrong. And believe me: Julia Ormond's cynical, bitchy character was made of the stuff our 80´s villains are.
Julia made MM a bit funnier.
She was not an alcoholic, though.
IMHO, they never "recovered" of Season 5´s low point, and maybe they (consciously or not) were trying to appeal wider audiences, but characters like Peggy, Betty or Joan didn´t deserve to be given second-rate subplots. In a way, I think the producers treated them and their performers with the same sexism the show portrayed, and sometimes even subtly condemned. If done by really talented writers (as happened here), soapiness equals laziness. And yes, I think it will be dated in a few years...and it´s set in the 60´s-70´s!! We´ll always have the actors and the fashions...Just my 2 cents.
Oh yeah, Betty. And you didn´t sleep
with Don on your first date!
Note to myself: Please don´t even try to re-watch MM in the next 5 years. You still have 500 new series to discover and 50 more to re-watch.

