If you stick with Lucas' movie version of the light and dark, you are left without much to build out on. Its dime store yin and yang poster symbolism preached as a training montage.
What you do with the power (say lift a spaceship out of the muck or choke someone to death) is obviously far more interesting. Luke deciding to not participate and help empower a dark protege is a reasonable choice, even if the explanation left a LOT to be desired.
I am not a big expanded universe guy, but my understanding is that a few authors made some solid contributions to a better understanding of what light and dark meant as a practical matter.
But what Lucas left on film, especially after the prequels, needed some new direction. In my opinion. Your mileage may vary. All rights reserved.
Anyway, I did not actually intend to come here and issue bad takes about Star Wars and JJ Abrams. I came here to post this: http://packerrats.com/showthread.php...Miracle-on-Ice