Works as an introduction to the Wii Remote, but that's as far as it goes.
Let's be clear. This game hardly even puts up the pretense of being an actual game. It's mostly there to teach you how to use the Wii Remote if you're a first-time player. And I suppose that, in that respect, it succeeds. It has nine games, each of which involve a more complicated application of the Wii Remote than the last, and each of which show the user a new way of using the thing.
The problem is that once you've gotten the hang of the Wii Remote and have played through each of the games once, it had no replay value for me from then on whatsoever. Each game does have a high score list so that you can keep track of the best you've done in each game. This was evidently put there in the hopes that it would inspire people to play the games repeatedly and try to get better. The only problem is that games need to be fun or interesting before I actually care about getting a high in them.
The only game that was remotely interesting was the last game, in which you are a tank and you have to use the Wii Remote to aim your turret, the B button to fire a shell, the A button to lay a mine, and the nunchuck analog stick to move around. This one could potentially be fun if I got into it. The only problem is that that's one game out of nine that is actually fun or interesting. That's a failing grade, however you cut it. I had heard that most of the games were boring, but I wasn't expecting that statement to be so true.
In the end, "boring" is really the operative word to describe the contents of Wii Play. They are not the worst games I have ever played, and they would perhaps make a good (and free) Macromedia Flash quickie on the internet. But they mostly fail to have any redeeming qualities to make them worth playing more than once or twice.
As said above, do not buy this game for the game itself. It is not worth $50. And even if you do need an extra Wii Remote, it's a tossup whether this game is even worth $10. It's mildly entertaining for an hour or so, but nothing much beyond that.