Whats mad men? I never heard of it
It's only one of the best things on TV right now, next to Breaking Bad, Game of Thrones and Homeland. It's a drama about an advertising agency in the 60's, which is a point of view from which to depict and break down the entire social context of that era. Plus it's just really well written and Jon Hamm as Don Draper is one of the best leading men in current TV.
Also, according to Wikipedia, it's "the first and only basic cable series to win the Emmy Award for Outstanding Drama Series", which it did four times.
So in short, a much better show than The Walking Dead.