Wow, I'm sure anyone here could write pages about this stuff.
The ROTJ duel was amazing and for the time, seeing Vader do a flip and Luke and Vader do some great "force" leaps was cool and it was very charged.
For the PT final battle, I agree with most of what has been said. The intercuts hurt (and why did Yoda leave, was he just worn out?)
It looks like Obi Wan is on the defensive for most of it, which you might expect from someone "far" more powerful with the force, but he holds his own because of training. As for that, since we are at the end of the era of Jedi and they have all been traoned by Yoda, Qui-Gon, Windu, et al, I totally buy them all having similar styles.
Also it is said somewhere that they are becoming arrogant (Maybe Yoda says it?)
Which would account for some of the flair and spinning the lightsaber in between steps, etc. They just got accustomed to kicking so much a$$. Remember they didn't know what "that was" when they met Maul. Clearly, they hadn't faced a foe from the Sith in a long while.
I also can buy the idea that they are fighting in a style we can't fathom. They are using weapons with no weight, that cut omni-directionally, that must be avoided completely (no deflecting it with your cloak!) And, they have this innate sense of what is happening which makes them seem like they have very fast reflexes. They can sense things before they happen, so they do know the blade is flying in right <here> to deflect it and this make the blade to blade fighting more believable.
Going back and watching the original Star Wars Vader v.s. Kenobi battle seems embarrassing.
Having some history helps, if you consider Obi-Wan beat Vader before, (-1 Vader confidence.)
Vader is "more machine then man" and maybe has less control of the force or fewer midiclorians (-1 Vader power)
Obi-wan has been on Tatooine, hanging out in hives of scum and villainy and training in the ways of the force (+1 Force ability?)
Obi-Wan has aged terribly in the years since Luke's birth and appears to go from 30-something to 60-something in what, 18 years? (-2 Kenobi is a weak old man, who should not have come back...)
Plus, Kenobi now wants to die so he can commune with Luke and Qui-Gon or something? So, he throws the fight to become immortal.
Okay.
As many of you have said, it is such common practice to fill in the gaps using whatever scraps of dialogue we can and inferences - it is second nature. What bothers me most is the disconnect between ROTS and Star Wars.
Obi-Wan talking to Luke about his father, Vader talking to Tarkin, his "ancient religion" (Tarkin doesn't seem to know the emperor uses the force?)
I always did think that the lightsabers acted like mood rings. Luke's started out white and got bluer. I never saw him make a new one until a couple of weeks ago, I guess that's when he made a blue one? When Han uses it to slice open the Taun-Taun, it looks pure white again to me.
I thought it was linked to them with the force and maybe wasn't nearly as powerful if a Jedi wasn't wielding it. Or something. I had to explain why everyone didn't run around with one!
So, I was also disappointed to not see Anakin with a red saber for the final battle.
I have watched the clone Wars to fill in some of it, Anakin and Obi-Wan seem to be friends in the series, though Obi-Wan only dispenses one-liners, no real thoughts or wisdom and Anakin is reckless, not really a great jedi, just a risk taker and a good pilot, so far.
Maybe the live-action series will help fill in more? I fear it will be all about young Boba Fett though, and not help "fix" any discrepancies.
Didn't Lucas comment in his Jon Stewart interview that maybe he should make another film, now that droids were more plentiful?
So, I guess my answer is a qualified "yes, I enjoyed it."
Wait, what was the question again?