This game is very much like jedi knight 1 (not the first few levels tho), but after them, it feels just like the old jedi knight. same kinds of puzzles, better story (IMHO), and the saber combat......drooool..... is plain awesome. It's so much more fun in this game than the original to hack up stormtroopers, etc. The force powers are used more, which is sweet, and you only need to do a few modifications to the original controls to get them to be more user friendly.
If you only slightly liked the original, you will love this game, if you "loved" the original game, you won't be leaving your house for a while