InFamous is just plain AWESOME. If you like an open world where you can go as you please while you do as you please then you NEED to get this game. Graphics, story, gameplay are all as near perfect as I've seen in a game in a very long time. Leveling up is easy and actually makes you feel more powerful as you progress. Even doing the side 'quests' like collecting shards is fun because exploring the city is a blast. Just a tip, save your game frequently, at first I thought it autosaved but it doesn't.
Infamous is a fun thrill ride from start to finish. The combat is cool the platforming is a lot of fun and the choice\karma system adds depth to the experience. At some points the mission's can be a bit repetative and the game is a bit short (which seems to be the trend of next gen games) but the ease of combat and character movement trumps the negatives. This game is a lot of fun. Solid 9 in my book.
Another note, leave the console war to other sites. Don't put a review up saying this game almost made me buy a ps3 but after 4 hours of game play..... Look its childish and unoriginal. If you didnt give a game a fair shake save the review for a different site.