In the end, it’s hard not to see Lost as the longest con of them all. Not because we didn’t get enough answers – it’s really true that after this episode, I don’t need any more answers than what we got. But because all along, Lost seemed to be a story. Until the end, when it wasn’t. In the end, it was just a bunch of stuff that happened.
It’s way too early to tell, but I have a feeling that this will go down in history with the “Patrick Duffy stepping out of the shower” thing on Dallas. It just felt like a cheap, cop-out ending. In a sense, nothing that happened in the “flash-sideways” universe mattered because they were all already dead, and they were going to “move on” eventually one way or another. And nothing on the island mattered, because… well, it just didn’t seem to matter very much.
Emphasis mine, and what she said.