For a moment there, I thought they would never make a better episode than the one where Desmond conscience time travels, but they did with this one! this is a perfect Lost episode. We got the most intense revelations in the whole series, there was a lot of action, and a lot of characters shifted their loyalty. What else can a lost fan ask? Did I mentioned the black smoke monster kicked ass?
This is a fine example of what good plots for a tv series should be like. Every detail was perfect, even from the start with Ben's piano song.