I jumped into Mad Men around the end of season 3 because my partner was watching it, and we've gone through 3 seasons in about a month. I realize I'm late on this, but it's the best television show I've ever seen. It's dense, subtle, thoughtful and sad, and meticulously, carefully builds a whole world and emotional experience in your mind. We'll talk about what we think a character is thinking or about to do and realize we actually believe they exist. There's such a huge contrast between that and how you might feel about a character in a lesser show, where you understand at all times you're watching a contemporary person in front of a camera.