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I was a bit curious about why Obi-Wan didn't finish Vader off while he had the chance... I mean, that would have seemed like the logical thing to do.

My impression of the end:
Vader: "Where's Padme?"
Emperor: "Hehehe... well, uh... you killed her."
Vader: "Rats! Well, at least I got a cool suit out of it."

What? You mean the sheer mediocrity didn't inspire you?

I thought the story was alright. The acting was pretty bad, though.