Star Wars, the original trilogy which includes Episode IV: A New Hope, Episode V: The Empire Strikes Back, and Episode VI: The Return of the Jedi, is a timeless classic.
I'll make this short:
Mark Hamill is the worst actor of the bunch, Harrison Ford, the best. The soundtrack is impeccable.
Concerning Lucas' revisions:
The modifications done to A New Hope, especially the Greedo-Shot-First debacles, and all the cut scenes with those less than appreciable CG creatures.
The Empire Strikes Back fared much better. The enhancements clustering around the city in the clouds are more subtle, better integrated, and led credence to the story.