Ending a show as complex and convoluted as Lost has been was never going to be easy, which is why it was a good thing a few years back when a firm end date was set, meaning that Season Six was definitely The Final Season. If it had soldiered on and then been cancelled without coming to a conclusion, that would have been infuriating (the lack of resolution at the end of Twin Peaks being the best example). But still, lots of people seem to have been enraged by how the writers decided to close things off.