I gave it a 5, which is probably as low as I have rated an episode. It would have rated probably a 7 or 8 if it was earlier in the season, but I'm frustrated that we have one more episode before the season finale and we don't have a clue about...
Why the Smoke can't leave the island, and what has to happen to let it go.
What would happen if the Smoke got off the island.
Why the Smoke takes human form at all, and why it makes mechanical noises and is averse to electromagnetism.
Why the Smoke Monster has to abide by the same rules about not harming Jacob that applied to Brother, who is lying dead and slowly decomposing in a cave.
Why Jacob could be killed by Ben...was or wasn't he made immortal by Fake Mom.
Who is Fake Mom, and why is she so powerful. Is she a witch? A God or demigod? Is she as evil as she appeared to be or just nuts from having to guard this wacky island with its all powerful light source?
Who finished the Donkey Wheel.
The statue of Taweret, the Temple, and the hieroglyphs in the tunnels.
How and why are people drawn to the island before Jacob became the protector of the island/light.
Why the Candidates? Jacob didn't appear to even understand why he had to protect the island. Why is he looking for a replacement? Did he know he would die? Does dying allow him to leave his post as protector, which he didn't want in the first place? If so, why did he want to prove to the Smoke that mankind isn't inherently corruptible?
What does "it only ends once" refer to?
Most importantly, why Jack doesn't have the same haircut on Oceanic Flight 815 version 2 as he did on Oceanic Flight 815, version 1.