I'm surprised to see so much distaste for the ppowerful heroes. I think that it is esserntial for the protagonist to be powerful. occasionally, a Frodo type may work, but i'd like to point out that frodo is NOT lacking in power. physically, for instance, he is superhuman in every respect but brute physical strength.
In any event, the gripping thing about all the Jedi is their power. without the power of the force, their internal struggles would be lessened, and they wouldn't matter. the greater their powers, the more they are tempted to turn astray, and teh more sever the consequences. The skywalker line is ambitious. none of them will ever really be accepted by the other jedi masters, like yoda, but they accomplish more than the other Jedi ever do. although Anakin's pride pulls him into darkness, Luke's pride actually pushes him into his success. if not for the hint of arrogance, he would never saved his firends in episode two or defeated Vader and the emperor.
A powerful protagonist has a number of advantages for the story
It allows things to happen- they can accomplish their goals
Ity makes their internal struggle mroe important: who cares if the cashier at your local supermarket is seduced by the dark side of the force? with a Jedi, it matters
It allows the whole story to revolve around the protagonist: Luke and Anakin hold the power to change the world, which means that when Luke does get his mind straightened out, he can save the day and bring the story to a favorable conclusion.
that said, what i said about Yoda still applies. i don't think Luke has it in him to be a Jedi master. his power with the force and his skills with a lightsaber may grow unparallelled, but he'll never be a Jedi master. that is because of that arrogance which allows him to be a hero.
Heroes are not perfect people. ordinary, well adjusted people become moisture farmers like Luke's relatives. or presidents. Luke is a hero because of that inner force which compells him to sacquire and use power. that's why heroes don't fit in with the rest of the world. after his victory in episode three, he''l either need to change his personality, find new evils to batytle, or become a useless drunk, becaus he isn't cut out to be a normal person, or a Jedi Master.
EDIT:
"Yet is this "fire" in the Skywalker family line what's necessary to bring the Jedi order back to life, so to speak? The order, along with the Republic had become so stagnated that perhaps this "purge" and rebirth was inevitable. The very thing that led Anakin to the dark side was what was needed to bring back the vitality of the Jedi order."
Yes. Anakin is the one who brought balance to the force.