Best Acted, best written, best directed? Empire strikes Back. It gets closest to what I believe star war's fullest potential to be. You have the swashbuckling, the drama, the metaphysical elements, the cool visuals. Then you have john williams putting the final cherry on top with his excellent scoring. It was arguably all down hill from here, each following film trying to re-capture Empire's greatness, rots being the one trying hardest. Lucas' writing aside the general concept of rots comes very long way towards topping it, but with the sloppy writing and over reliance on cgi the magic's hard to recapture no matter how many hands are chopped off...