I almost was hoping they would do something really awesome with the ending.. something that would have more people talking. I think they took the normal way out.
It would have been cool to do something St. Elsewhere - ish just to d^ck with people. Have all that happened with the man in black happen, and then Jack stumble around the island and realize he still can't get off of it and he can't seem to die, and then flash sideways to a new place- with Jack being wheeled around a mental hospital with a little snowglobe with the island in it. Cut to black. The end. DUN DUN DUUUUUUN
People would go apes*#$.
http://en.wikipedia.org/wiki/Tommy_Westphall