I personally enjoy watching him fight. He doesn't win decisions based on lay and pray tactics or by sprawl and brawl kind of striking.
He's quick, elusive, and varies his movements and striking techniques enough to keep his opponents guessing. He may not be producing KO power in many of his shots but their is no questioning his ability to land them. He sees openings and is able to capitalize on them even if he doesn't put the guy down (knee to Tito's liver is an exception). I think he does a good job of representing what Karate can do if trained properly.
Unfortunately since so much attention is paid to his Shotokan training and so little paid to the fact that he is a BJJ blackbelt I am sure we will soon be inundated with Shotokan nuthuggers pointing to him and saying, "See, Shotokan works, it kicked that wrestlers ass. Our secret grappling techniques in our Kata is what allowed Machida to keep things standing!"
In any case it gives me hope that I can use my Kung Fu training as effectively with the proper training methods.