I'm about halfway through my second play of the game, and I have to be honest when I say that it is much more satisfying when you've got (most) of the powers on the second time through. Force Lightning is invaluable, and is by-far my favorite way to get rid of enemies, but I'm starting to chuck the lightsaber around far more often, and just switch my moves up now and then to make it interesting.
I've also noticed that combos seem to be easier to do the further you get in the game. Perhaps its just having more of them to do all together, but I'm stringing them along nicely.
I did finish the game the first time through with the "Light Side" ending, and I have to say, it was pretty satisfying. You get a good sense of how the prequels are tied in with the origional films there, and truth be told, it makes me excited for what we could see in the live-action TV show that is in the works. I do hope the rumors are true that Starkiller could be a part of it, or the lead in a movie all his own. Nevertheless, the story is worth the price of admission, small issues with the game aside.