Decent, but not as good as its predecessor and way too short.
But it sure isn't as good as the previous version, it feels slower and not as smooth ( the running-speed is ridiculously slow .. ) and the combat doens't feel as good as the previous version. You'll often end up runningaround like a wildman blasting lightning strikes and force blows at invisible enemies.
The story isn't as interesting as the previous version eithers, it's rather predictable and boring. You won't experience the "damn they completely fooled me" feeling.
But the fight at the very end of the game was the biggest turn-off.
The big stand-off between you and vader is just boring and disappointing. The moves are to easy and predictable, and the only hard part is repeating the same series of fights over and over.
I still enjoyed the game though, I just whished it was longer and especially deeper. It really feels like they went for all the fancy effects and forgot everything that made the previous game great.