I'd have given this game five stars but for one or two little niggles.
The physics of the ball and the use of the Wii-mote are excellently implemented. My sons (8 and 3) can both play it, even my wife likes it! You can play four players (obviously taking it in turns), and you line up the shot before swinging the Wii-mote to build the power of the shot. There are some sub-games if you get the ball into a special area, the completion of which will give you a hole in one.
What I don't like is the single player game, which very rapidly dulls. Each 'course' is made up of three holes, one of which is a 'challenge' type where you have to basically guess at the answer and get the shot in one go.
Unfortunately, in order to unlock all the courses you have to plod through the single player game. To me that defeats the purpose of a Wii-game. It's a communal console, and multi-player should be the driving focus of ALL the games. Single player should offer a different aspect of the game (like in the excellent BoomBlox), without compromising the multi-player.
My other niggle is that the four characters are forced upon you. It should have used the Miis.
If the game came with all the courses unlocked for multi-player, used Miis and ditched the challenge holes, this would have got 5 stars. What's in the game though is still well worth buying.