I just rented this game, I-Ninja for the PS2.
It is a platformer/brawler.
It is extremelly fun, but gets old after awhile.
It's pretty cool how you can use turrets, and boats and other such things.
Even though it looks childish, the fighting can get somewhat complex.
Oh, and by the way, if you do play it, you will quickly discover that the first few levels have extremely Super Monkey Ball-ish parts to them.