moho_00: I have it on GameCube and yeah, it was really good. Maybe I just sucked at it, but it seemed like it got really difficult later in the game (more so than I would have expected).
The higher level you get the harder it gets - if you want to complete it it's best to charge through as quickly as possible doing the minium amount of battles - high level enemies have lots of nasty abilities. At low levels if you use the combo meters you have a significant advantage.