Yeah, Luke and Vader, in ESB, it feels more like a fight where they are reacting as the fight happens to each others moves, not knowing them in advance.
The prequal fights might be more fast paced, but they are too well choreographed, its always lunge, perfect block, repeat until its time for a character to die, then they suddenly forget how to block.
ESB was like a street fight, and I love how Luke is able to actually hurt Vader at times, even though after all these years Im still not sure how the steam hurts Vader, the blade to the shoulder sure does.
Luke V everyone on Jabbas barge is pretty good though, if slightly marred by the guy who shoots Lukes hand, just standing there for a couple of seconds, forgetting he can actually shoot again, while he waits for Luke to kill him.