The show takes place in New York City and takes its views into a 1960's advertisement agency called "Sterling Cooper" which is a fictional company designed for the show.
January Jones, doesn't have any power unless she consults with Don first. If she does something with out asking him first then he often gets mad. The other female characters in the show are also viewed as a lesser to men.
While the women in Mad Men don't have much power in the show, their character often have the largest impact on the viewers. In my opinion the women in the show are extremely powerful because, as young adult, I have never known a world where women weren't equal to men (or at least considered to be). Women in our time period have all the same rights and also occupy many of the same jobs as men which would been outrageous to think of back in the 1960's.
Mad Men in my opinion is one of the best shows currently on TV. It is a very unique story isn't over-dramatic. I find it to be the perfect mix between a soap opera and a drama. If you don't watch Mad Men, I highly recommend you start.