Fun to play, but not nearly as immersive as previous game in the series.
Other than that, the game didn't feel as immersive. For most of the game, the environments felt too unknown. It didn't feel like I was really in the Star Wars universe. But it DID feel like I was in a fun exotic place and some of the places it does take you are interesting, especially from an expanded universe perspective.
Gameplay is where this game really shines. The obstacles and such were much more interesting. The game was harder and more fun to play. The Jedi powers felt more useful and more fluid.
It all really comes together by the end, when you're trying to deal with the Ysalimiri that negate the force. It was such an interesting jungle to get through. It was far more challenging (and fun) than most of the stuff in the previous games. It just didn't feel as immersive.
All in all though, I don't think people really appreciate the gameplay challenges this represented. They really fine tuned things play wise, and a lot of people (at least folks that I've talked to) just didn't get it. I personally have mixed feelings, but it was still a great game to play.