delericho said:
1) During the Jedi Purge, Vader would have to fight lots of Jedi knights. Assuming he applies the same code of honour as the Jedi and Sith seem to adhere to in the prequels (that is, you fight blade-to-blade without interference), and assuming what we see in RotJ is the best he can do, it would seem that there should be several Jedi who could take him out. Darth Maul is just so much faster.
Well, if you listen to the EU at all, we'll find out soon. A book about Vader in the Purge will be out soon.

But, considering the brief things we saw of the start of the Purge at the Jedi Temple, there is no honour among Sith. By the time of the movies, Vader
was older, too, and arguably out of practice compared to previously.
There's also the point that being "More Maching than Man" actually hindered his ability to use the Force(i.e. improve speed and reflexes) and caused Vader to be much less powerful than he had been as Anakin. The Vader we see fighting Obi-Wan on Mustafar is the strongest he ever was, and then only because the Dark Side was feeding him.
2) Obi-wan is an old man, yes, but Dooku is quite a bit older (he trained Qui-Gon after all). If the characters are the same age as the actors who portray them, we're talking late 70's vs mid 60's. Of course, the circumstances of their lives are very different but, still... I don't buy it.
Two things on this one, though. The first being that Dooku, having fallen to the Dark Side, was using its power to strengthen his body and reflexes. It made him faster, stronger, etc, for the short periods of time we saw him for. It wouldn't have worked forever, of course.
Not only that, but also Dooku was involved in a war in his old age. He was constantly fighting and practicing. Obi-Wan, though, sat on Tatooine and hid as best he could while watching over Luke. He didn't keep up his skills and, by the time he did fight on the Death Star, wasn't even fighting to win. He was simply fighting to buy the other's time.
3) In RotJ, once Vader realises the Luke is matching him trick for trick, I would expect him to pull out something that Luke hasn't seen to throw at him. A skilled swordsman would do precisely that - put your opponent off-guard. And especially at the end of the fight, where Luke is attacking in a rage, there should be something Vader can do. I refuse to believe that the Jedi academy didn't teach students how to counter precisely that sort of attack.
By that time in RotJ, though, Vader is on the edge of redemption. Not only is Luke's rage making him stronger and faster(again, the Dark Side feeding him), but Vader is becoming less and less confident in his wish to actually kill his own son. And Vader also discovers right then that he's also got a daughter...that can't exactly help his state of mind, either. That, and there is probably an element of shock and surprise at how suddenly and violently Luke attacks in defense of the idea of Leia falling.
I rather wish George had included a score-only track on the DVDs, though

.
Buy the soundtracks.
