I have not played it yet (2.5 more days can't wait!)
But don't let the looks fool you, the game is supposed to be very deep and contain a lot of intellectual ideas and themes. IGN Australia gave it a 9.1 and Nintendo Power gave it a 9/10. It is currently the 10th best game as rated by critics for the wii.
The gameplay has been described as a cross between Pikmin, Harvest Moon, and Animal Crossing, with a bunch of originality thrown in.
I'd suggest going to metacritic and reading some of the reviews from there