The thing that wrecks it for me, and wrecks the Force for me in general, is all that wonderful control Vader exhibits over the entire duel is mocked and made pointless when he reveals that, at any time, he can simply start throwing brick-a-brak around with his telekenesis. Pfft, why have duels at all?
Sorry, but I hate the telekenesis aspect of the Force that was grafted onto it for Empire Strikes Back. Kinda makes things a little too easy, if Jedi have to power to move all objects at will. What would they need lightsabers for? Or any other skill for that matter? It's too easy, and too cheesy. Personally, I'd like a little less Carrie in my Star Wars.
But I guess that's just me.
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