Definitely the worst finale, but also borderline pointless as an episode. The point of the finales up to this point is that they answer huge, series-hinging key questions we've been dying to know while also asking mind-blowing new ones.
In the first finale we met our first group of Others, went to the BlackRock and actually saw the Monster, finishing with a glimpse of the Hatch's depth.
In the second one we saw the Leg statue, found out Ben was the leader of the Others, found out the button-pushing was real and what happened when you didn't do it, found out about the arctic station and Penelope's search, saw Desmond's life and found out what crashed the plane.
Last year we had them make contact with the frieghter, see the first flashforward, and kill most of the Others, which isn't as much as before but the previous episode features Ben's back story, the Richard Alpert mystery and introduced us to Jacob.
What did this one answer? The person in the coffin, which all the characters already knew and had been hidden from us alone through camera angles. Shocking. The island moves, Jin dies, etc..... they told us this stuff was going to happen already. The only thing resembling a question is "what's the deal with the frozen room".... THAT'S IT?
This wasn't a LOST finale. This was a regular cliffhanger, same as every episode, in fact, less than most. I want a LOST finale. I want LOST back.