The lightsaber fight is not as intensely choreographed as the other films, but it never really bothered me too much because we CARE about those characters. The prequels were more about the action and less about characters you cared about.
As I mentioned in Ady's thread, just "throwing in some music" in that scene is not a way to make it work. The lack of music during that fight is a very important and deliberate choice; because the entire movie is scored, not having music there brings more weight and importance to the scene - it makes it more tense and "realistic" because the presence of music always lets you know you're watching a story, a fantasy; the lack of music focuses you more deeply. This is Ben's last moment, and adding music to this scene "fluffs" it up and puts the focus on the film making - without it, you are more "with the characters."
In addition, the lack of music for a few minutes gives the next piece you hear more vibrancy, and "Ben's Death" is one of the most emotionally stirring parts of the score; by adding music right before it, you take away from its impact.
Ok, so it's not a fast light saber fight, so what? Does it make you not enjoy the film? If Ben WERE doing back flips and spins, you'd be pointing at the screen saying "cool!" as opposed to genuinely be worried about the plight of the character. EMPIRE has the best lightsaber duel of all the films because you CARE about what's happening. The prequels have far more action in the fights, but I was bored to death because back flips and high jumps don't make it a better movie.
I like most of what Ady did, but my friends and I were horrified at the music added to the saber fight in ANH. It doesn't belong there and is a far worse change than anything Lucas ever did. I'll take a 100 Greedos firing first over THAT.