Though it's not an upbeat, feel-good film, it's one worth your time. Instead of a Hollywood ending we get a Shakespearean-style tragedy with an Eastern twist. For anyone willing to pay attention, there are deep truths here about the flaws and failings that are common to humanity regardless of from where one hails.
The creators have, in the 20+ years since the only season, so far refused to make any further episodes or material beyond the end of the main story. (Of the live-action Netflix remake, let us not even speak.) This film then, is not a sequel or even a prequel, but a tale set during the main run of the show as a kind of extended episode inserted probably in the latter half of the timeline of the television run. The movie does feel something like an extended episode of the show, but I would say that's a compliment to the show rather than a criticism of the movie.
Luke's code is simple, he refuses to bend the knee to any man for any reason. Luke doesn't want to rule, he wants not to be ruled; he is unruly.
This is, according a range of folks who are in a position to make an informed judgement, the greatest movie ever made. I'm not sure that's my opinion, but it's a very good movie in a lot of ways. It's a great movie to be sure. And while it's not my pick for greatest ever, I'd probably go so far as to agree that it's the greatest popular film ever made.