Extremely good game.
The graphics weren't exactly great, but at least you could tell what was going on. There's not much special about the 3D effects, but the backgrounds were perfect for this type of game.
The sound was good. It never had anything that was completely unbearable, and it was not over the top, so I gave it a perfect score.
You're not going to regret getting this game, you'll play it over and over again. This game may not be as good as the others, but you will love this game.
In my opinion, this game is practically flawless, but, I have to be slightly more honest than just what I think. It's a great game, if you want to try a new game, this is the perfect one to try out if you only have a PS2. But since you most likely do have a computer, you should play the first three games before this.