Buy the GameBoy Advance version instead
Let me start by saying this is not an awful game. It has bright and colourful characters and the graphics are surprisingly good however everything else about this game could have been improved.
The fighting system is a big let down. In the battles you will almost randomly use attack which usually miss whilst your allies do nothing helpful. The special attacks are either not powerful enough or two slow so generally I don't use them.
The menu system is good but a good menu doesn't make a good game.
The music is almost painfully boring, there's no speech and very basic sound effects, the Characters are generally annoying and there are no puzzles to work out which is one of the reasons why I buy RPG's. On top of that there are several frustrating moments, like when your breaking into a prison and your characters remove their disguises because they smell, then a guard comes round the corner and kills you.
This game had a lot of potential however it's just boring. Poor sound and poor fighting counteract the good graphics and whilst some people may enjoy this game (and it can be good at passing time) This is not a game to buy. Save yourself a lot of money and buy the GBA version if you really want an Avatar game.