It's just plain bad.
Where to begin, where to begin. I don't have to make this too detailed anyways, as detail is one of the many things this game lacks...
Gameplay: This game is functional, I'll give it that. You won't be glitching through walls at least... that's where praise ends. You do countless collectathon quest in order to advance the story and occasionally meet a boring enemy or 2. Options are small and the multiplayer had even my parents who like any game running away to put in a better game. Graphics:
Occasionally the world can look big, but for the most part, you're looking at poor animations, poor textures, poor effects, and really cruddy level design.
Sound:
Oh how I do love repetitive phrases repeated over and over and over again, with as good as silent menus.
Value:
I don't even need to mention much. There's unlockables but the chances of you playing to reach them, considering how bad the minigames you unlock are, is slim to none.
Overall:
Don't buy, no matter how cheap it looks. Just get an ice cream cone with the money you might think of spending on this game. It's a bad game poorly ported to wii with bad controls.