Great for a game that comes with your Wii mote or for first time Wii players.
What Wii play is really for is to teach new players how to use the Wii mote in the correct way. Each of the mini-games get you to use the controller in nearly all possible ways. For example the first game is shooting, you learn how to aim at the screen and press a button to shoot. Later on you learn to move the Wii mote in dimensions until you get to using the nun-cuck and pressing lots of buttons to do different things. Essentially Wii Play acts as a Mini-Game Tutorial.
This sound a little weird but it really works. All the Mini-games do teach you how to use the Wii mote and is great for people who have never played a Wii or especially games before. It's a really good idea they packed this in with the Wii mote because there isnt really a Wii mote tutrorial like this.
Some of the games in Wii Play arent as fun as you would expect for example table tennis all you do is move the paddle side to side in front of the ball. But others like charge are loads of fun where you have to ride a bull and knock down scarecrows. After youve played through the 9 games a few times, there isnt really much to do. The only depth the game really has is through getting medals for each Mini-game which could take some time as reaching gold in each one is very hard.
Overall Wii Play is great if your new to the Wii or want an extended tutorial and it comes with a Wii mote in the UK, AU and soon USA. Although it may not have much length or depth its still a great idea to teach newcomers exactly how to use the Wii and what the Wii can do.