How can you say that they look too good to be real? These are people who have been trained to manipulate the force in order to heighten their natural abilities. If you asked me, the combat in the movies has always seemed kind of sluggish and deliberate. This is especially true when you compare it to other current films like Spiderman, The Matrix, Crouching Tiger, or Blade. Think about it. In EP 1 we see Qui Gon and Obi-wan use super speed to run away from those powerful droids. They move so fast that they are a blurr! Where is this speed during combat?! You'd think that if they were capable of moving that fast, that the one time they would make sure to do it would be when locked in mortal combat. Instead the fighters seem like well trained martial artists, not like beings who are capable of superhuman performance.
Maybe it takes more concentration, and in battle you would be more interested in judging your opponents next move, were to defend, were to strike, a weakness in his technique.........and as you will probably agree a hell of alot more demanding than simply running away! Anyway thats what I think