I don't know why everyone in this thread thinks season 2 is so great. The whole "push the button" saga wore thin on me. My favorite season is season 4, because it picks up the pace and has a lot of memorable episodes, at least in my mind. My favorite characters are Locke and Jack, partly because it's interesting to compare them to each other over the seasons, and they, along with Desmond, have the best flashbacks.