If you were hooked by the first one it could be worth it... I wouldn't recommend it
You will also be into it if you ever got engulfed in any of the halo games...
But if your a fan of more realism in your first person shooters then this is not a game for you. Now it's not that I don't have an imagination and have a problem with the AI characters. But its the weapon damage and how little the gun fights drew me into the game.
Yes the graphics are impressive in areas but it just never lived up to the hype as graced by many previous reviews for me and as a result I wasn't even bothered about finishing it... My advice would be get BioShock, Killzone 2 or just wait for the new Call of Duty to come out because if this is worth a 9 there going to have to crank up the rating levels to 11 Spinal Tap style for COD!