The justification for the prequel's lightsaber fights being over choreographed is the argument that story wise, light saber fights don't make that much sense being so dynamic. At least in the mythos set by the original films.
Action wise it's an amazing spectacle, but at the same time it makes it hard to convey any emotional character through them.
At the same time, that actually makes sense because Jedi's are supposed to keep their emotions at bay, you would expect emotional under trained jedi like Luke to be more sloppy then Anakin or Obiwan.
But there are a lot more problems with the prequels than just the lightsabers. Granted, the issues mainly arise when you consider the films in the canon rather than standalone. And the fact, that Lucas pulled things from the trilogy that made no sense in the prequels, like the padawan training.
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