He was boring to me when I was younger but as an adult he does a fantastic job playing a relatable protagonist who yearns for a better life and embracing his true potential. If Han Solo is a bad boy it seems reasonable to me that the other male character should be his opposite otherwise its boring. Luke got more awesome in each episode and by episode 6 he is a complete badass. I mean he is wiser, calmer, avoids conflicts when necessary, extremely reliable, tries to reason with his father, and his scenes with Vader are absolutely fantastic.
Facts. Luke grows the most throughout the original trilogy.