The end of Lost (with obscure spoiler alert)
I was fooled. I really thought in the last episode we were going to learn the golden light held a nanobot cloud from the future, trapped on the island by The Incident, which became sentient when the nameless one floated into the cave. And the crash was intended to unwind the events folded in and out of time, so that one timeline didn't happen (explaining the parallel time streams). Et cetera.
The masterful head fake when they flashed back to Season 1 finding the stones in the cave led me to believe we were coming to a final clash of good and evil of King-ian proportions, one that had indeed been planned from the beginning. In other words, a genre story. But instead, they punted on all the major story elements in cussworthy fashion.
The comparison to The Prisoner is apt. Remember when Rover takes off in the rocket ship? I thought we were going to see the smoke monster do something very similar. And Sawyer says "I'll be seeing you" in the last episode too (apart from the credit sequence, probably the single most quotable and quoted line from The Prisoner). But the difference is that The Prisoner was episodic and every storyline resolved in the space of one hour. There is debate about which order to even watch the episodes in because there is so little continuity.
There can't be any such debate about the right order to watch Lost in. It was all so plotted and deliberate, or really (now) deliberate-looking. It was building. But in the end the climax fizzled out.
So on the one hand, I think people will be studying Lost the way they study great art. But I take it as kind of a failed experiment in making art without catharsis, and ultimately without the unities.