Mmm, I don't think so. There have been a lot of changes this season, which was off-putting to me at first, but I think they had to do something big (like SCDP) to keep it fresh. It's definitely a different show than it was in the first season.
I'm pretty happy with how things are going now and I don't feel like my interest is waning. I do think tonight's episode was very necessary, though - they needed to get the plot moving along. To me, it seems the last few episodes before tonight's have been more focused on making statements about the social/political climate of the time period than developing the plotlines. It was interesting stuff (especially since I wasn't alive to witness it!) but it felt a little bit like stalling. All the action in tonight's episode should make for an interesting rest of the season. I'm still wondering about Joan... did she or didn't she? I think she didn't.
I AM glad you made a thread to discuss Mad Men, though!