I've watched three episodes so far (went ahead and started recording them when the show started even though I wasn't sure if I'd end up following the series) and it's been fairly interesting.
I'm with PG-13, however, in saying I don't really care for what happens to any of the characters. Maybe that will change by the sixth episode I watch, but so far, I've never been sympathetic with people who cheat on their significant others, which seems to rule out all the male characters on the show.
I liked the first two episodes with the subtle differences in eras of then and now, but with the most recent episode I watched, they could not have possibly thrown in any more politically incorrect references if they tried, it was just so over done.
And as much as I realize how women in the workplace were treated back in 1960, makes me uncomfortable watching it each episode, I feel so bad for them! At least they should keep the show going until they hit 1970 or something and women get some rights and have a voice so I can feel better about going into the office again, hehe.
Overall, though, I notice I tend to share opinions with viewers about programs, rather than critics, and all the hype I am hearing is still from critics and not from anyone I know who is still watching it. (Most friends were excited to see the premiere, due to all the good things that were being said in the press, but it didn't live up to their expectations.) I'll watch the other episodes I have recorded, however, and see if I can start caring about any of the characters.