Understandably lightsaber fighting should be different from any form of conventional sword fighting on this planet.
The blade can cut through almost anything without adding physical force.
Just lightly brushing against the blade could have lethal consequences.
The fighter's own blade would be as dangerous as their opponent's too.
Also the people using them have superhuman reflexes.
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.
He is meant to be a Sith but does that turn him into superman?
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.
The most compelling duels for me were the delicate dance in ANH and the careful but forceful style of ESB.
ROTJ seemed more of a bashing match to me but part of that was the set design which didn't allow for interesting camera angles.
The duel in ESB is beautifully framed.