The characters and story absolutely grabbed me, and I actually grew to care about them. Which is saying something, since I'm generally stone-hearted enough that I look at most fictional characters with analytical detachment rather than emotional attachment.
To back up what Winterfox said. The characters in the story are fantastic. They irritate, please, and amuse you. There are several different ways to play. Mostly involving the light or the dark side. All PC variants are human however.... <img src="/ubbthreads/images/graemlins/disagree.gif" alt="" />
What I also like is that almost every stat point is useful. You cannot 'powergame' without sacrificing something else. Any stat raised too high will take most of your starting points. You can create an uber-strong warrior that will slice through every tough enemy but would likely get paralysed and frazzled by a decent force-user. Well, if the AI wasn't so bad that is... <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" /> Especially that of your own party members. Its a minor thing however. I find the scripts for the characters to be useful most of time. Lifesaving even....
I find the linearity nice. i.e. not too linear but you remain on track. There are virtually no 'fed-ex' sub-quests and the puzzles are tricky but not too convoluted. Especially some of the mathmatical number puzzles.
Mostly I love this game because I am a fan of science fiction. Its scope and potential far outstrips that of fantasy but is rarely seen. I sit back and watch the lightsaber fights with a grin. (when I can) They are fantastically done. Being able to choke your opponents like Darth Vader or fry them like Sidious is priceless. You will never be lacking eye-candy in this game for sure.
It has its bugs. No game doesn't. There are one or two that can be exploited nicely too.... (features <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />) Others make you scream. I had several crashes with cut-scenes. Oddly enough my second time through they seemed to dissapear.
Honestly, all I can say is buy it, play it, love it. The force will free you. <img src="/ubbthreads/images/graemlins/alien.gif" alt="" /> (Sith creedo)
Womble, arch-geek. <img src="/ubbthreads/images/graemlins/delight.gif" alt="" />