Actually, there are some people who thinks the game is not really worth buying, but there are some others who think the game is a Must-have.
Take for example IGN USA and IGN UK...
IGN USA gave the game a 6.0 - Passable
IGN UK gave the game a 8.0 - Impressive
I already have this game, but it's not in my hands (the wii isn't too ), I will get it tomorrow, so I consider it a worth buying.