While I'm not saying anything bad about CG, I must say that one of the things that makes A New Hope, The Empire Strikes Back and Return of the Jedi so great was the fact that even though there were lots of special effects it was still mostly real actors and therefore more believable.
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'cept for the non humans.
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Your either blind or stupic, all the character in the original movies were either actors or puppets, they were made from solid matter, there were no computers used therefore they were more believable in my opinion.