Sure, good fighters and graphics, but the Story Mode was dissapointing.

User Rating: 8.2 | One Piece Grand Battle! Rush PS2
What would you do if you had One Piece characters fight each other? You get One Piece: Grand Battle. I would probably say this is influential because you get the chance of playing your favorite character.

Of course, there are some fights that have to be settled. Definitely MUST be fought and settled.
Fights that are imminent are:
Luffy vs Zolo (They spelt his name wrong)
Zolo vs Sanji
Nami vs Sanji (Lover's quarrel gone wrong?)
Nami vs Luffy
Luffy vs Usopp (Captain battle LOL)

The only problem with this is the Story Mode. You'll feel something like this, "Haven't i done this before?" Only at a different Difficulty.
But the unlockables are definitely worth going through everything, including the Mini-Games, Training and the Tourney.
Overall, it's quite good.