Personally I think it had great potential ruined by poor realisation. Admittedly I've only played the first one, but only because I'm reluctant to play the second, considering how much I disliked the first one.
Firstly, I couldn't help feeling it was effectively a tech demo that they had drawn out into a full-length game. The story was short, but only because there was little substance to it; a bit more story, dialogue, few more characters etc wouldn't have gone amiss. The physics were great and the environments pretty, but the combat itself got repetitive, grindy and occassionally broken; on more than one occasion, I was chain locked by an AT-ST shooting me across the floor till I died, unable to get back up and evade. Most enemy types are very easily defeated by Force Lightning (as Yahtzee quite accurately pointed out) and maximising your ability to use it makes the game rather easy. It was linear, but not in a good way; if it had been a longer game and added a little variety as time progressed, it would have been so much better, but otherwise it felt too short and repetitive.
Also, there were a few, in my opinion, diabolical scenes, such as 'fighting' the Star Destroyer (Kota's (I think that's his name anyway) lines got very infuriating after they were repeated a dozen times), grinding through the Death Star's defenders and of course, fighting Vader for ages... And the whole decision at the end of the game felt really stupidly unnecessary; I can't help but feel it was pointless and the fact that if you kill Vader, you automatically decide to try and fail to betray Palpatine (and somehow fail, even though if you go with fighting him otherwise, you could pretty much kill him, but decide not to).
Overall I kind of felt the story was shallow, but only because the game wasn't long enough to allow for much depth and the gameplay, although intuitive, got too repetitive.