Bingowings said:
Where Lucas went wrong was not matching the ability of the OT characters to those in the PT like with like.
Dooku spins, cartwheels, leaps and kicks in a way that makes Ben look...well like a real old guy using a sword.
Vader is a cyborg in the OT and yes he only has two arms and his hands don't spin at the wrist (which begs the question why if he is a more advanced cyborg?) but he is also a powerful Force user so he should have an edge over a non-Sith, non-Jedi Cyborg even with his extra spindles.
The cyborg/old man line doesn't really hold that much water with me.
I would say that Dooku spinning and flipping like Greg Louganis makes DOOKU look bad, not Obi-Wan in ANH.
(although for what it's worth, Obi in ANH and Luke in ESB both have at least one 'spin around for no apparent reason' moment)
Forget everything George Lucas has ever said. Forget all external explanations and look at the films.
Obi-Wan is an old man. While quick as a whip at times (the cantina) he's still and old man. Vader even mentions is ("your powers are weak old man").Obi's powers are of a more spiritual nature ("strike me down... yada yada")
Vader is a massive man in cumbersome armor. Whether he was supposed to be mechanical or not in ANH is irrelevant, nimbleness is not his gimmick. He's a fucking tank.
The fight bewteen Obi and Vader in "Star Wars" is exactly what a fight between an old man and a black armored cyborg juggernaut should be. Pointing out it's an old man v.s a cyborg is not implying there's something wrong with it.
Go to ESB and you have Luke, who's way faster than Obi and all full of juice, up against the slower Vader. Vader still totally out matches Luke, casually kicking his ass with a one handed defense and then telekinetically throwing shit at him.
Just because Vader is a cyborg doesn't mean he's not badass. This is exactly what a fight between a rookie v.s a cyborg should be. It's more dynamic than the duel in ANH but not as frenzied as their rematch in ROTJ when Luke is no longer a rookie.
TPM has Darth Maul, who's a whirling dervish of death, the likes of which we hadn't yet seen, and a lot of the pizazz in that fight comes from the fact it's also a chase.
ROTS has two of the best Jedi in the galaxy going at eachother with all they have, and given how the Jedi use the force in the PT (love it or hate it) I think the fight makes sense up until the FX orgy when the building collapses.
So we can look at the evolution of lightsaber fights as a change brought on by better FX, more attention paid to choreography, and eventually Lucas's changing philosophy of spectacle over story.
OR
We can see the same fights as making sense based on who is fighting, why and how, as presented in the films. There is no need for any kind of external explanation. And while the PT as a whole suffers from style over substance, those saber duels makes sense to be more dynamic (dynamic =/= better) given who's fighting, why and how.