Definitely worth buying, I have it myself, and it frickin’ owns!
Believe me, if you enjoyed the basic gameplay on the first one, be prepared to be blown away. The graphics on this one have advanced to the point that the in-game cinemas almost parallel the anime cut-scenes. So frickin’ cool that you’d just have to play the whole game through yourself.
Also, Jehuty is shown in all it’s glory in this one, and you get to do what you wanted to do so badly in the first one, toss Anubis around like a little rag dall.