He wasn't during the time when the original trilogy was being produced and released. The nitty gritty aspects of the Force and Jedi swordfighting hadn't been explored -- we had no reason to think anything of Luke matching with Vader. He had learned to tap into the Force, and to use a lightsaber. He was also the son of a great Jedi Knight, so there'll be a lot of natural talent in play. Even so, the Emperor's powers far overshadowed the young Jedi.
With the expansions of the prequels, well yeah, Luke's power growth becomes absurd and illogical. There are thousands of Jedi, each trained from infancy in the art of lightsaber combat and the Force. And their fighting styles were so much more sophisticated and energetic than what we saw in the original films.
Luckily, George Lucas was well aware of all this. He was the one behind it, after all. His rationalization amounted to Vader and old Ben having slipped far beneath Jedi standards in the 19 years between trilogies. Ben got old, and Vader was a cripple. By the time we see them in the original films, they're washed up. Luke was young and bright, but his training was limited, and he learned from guys considerably past their prime.
The sequel trilogy has no excuse, however. It was developed with the prequel background already in existence, yet angled for primitive choreography and just-add-water power growth.
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