I started watching this after seeing a bunch of shit about the third season starting. I ended up watching all of the first two seasons, and I have mixed opinions.
I think the show gets way too much praise... it's good but definitely not among the best TV dramas ever. Jon Hamm (the main character, Don Draper) is awesome in the same way that Hugh Laurie carries House... without them, the shows would really not be very interesting. I'm still looking forward to the rest of season 3, though.
Have you seen it?