For a Star Wars fan, this game comes pretty close to perfection.
Story: Amazing. They have really done it. It is just perfect and Starkiller is an amazing character to have as the main protagonist. Vader is also very good.
Graphics: At first, I played this game on the Wii. After a few levels, I put it away and traded it. When I popped it in my 360 and played the first level with Vader...speachless. This game looks really good. Each area has it's own look and feel.
Sound: They got it just right. The voice acting is above average as are, of course, the music and sound effects. It's exactly what you would expect from a Star Wars game.
Game play: Superb. I enjoyed it very much. I really felt like a super confident Jedi / Sith all the way through the end. The Force powers are amazing and the environment is your best friend. You can destroy a lot of things and toss every enemy around. Very fun.
So, I would recommend you buying it. I, for one, bought the Ultimate Sith edition. While the main game is top notch, I must say I have a special place in my hearth for the DLCs. When I first started Tattoine, I felt like I was in the movie. And for a fan, nothing can beat that. Good job Lucasarts.