Like I said, he looks cheap and different because he never had to go up against a strong Jedi Master
OR: he looks cheap because the production fucked him up.
Have you looked at Vaders costume and helmet in A New Hope? Cheap looking, but for The Empire Strikes Back, they had the bigger budget and made his helmet shine and made his suit better.
Future Spoilers:
in the final duel Obi-wan Kenobi destroys a part of Darth Vader’s helmet, so he gets a new helmet before A New Hope.