Wii Play isn't a game you would buy by itself but as it came with a include controller it's definately worth looking at.
It can only do 2 player at the most and is compatible with Mii's. It comes with a Table Tennis Game, which was a little disappointing as in the single player it's just rallys however you can only rally up to 100. Also the control mechanism is a tricky to use and it's less like Wii Sports Tennis and more like Pong were you just move the bat in front of the ball and don't swing it.
Laser Hockey is insanely diffecult at start, it basically is a futuritic pong. You use your Wiimote to control the paddle, you will soon find yourself scoring more own goals than getting the ball over to the other side of the arena. You also find your Wiimote point away from your TV and your paddle gets stuck at the side as it cannot leave it's side of the arena. Although this said, Laser Hockey doesn't disappoint, this game will have the whole family laughing and smiling whenever you play it.
The fishing games doesn't take much to catch a fish and is nothing like fishing. Mainly all you have to do it dip you hook in the water which is a challenge by itself, and wait for a fish to hook on, and then raise the controller towards yourself and there you go you have caught a fish. This game is one you will play once or twice and never again.
Duck Hunt is probably one of the more fun games on Wii Play in which you play 5 levels of just shooting things on screen by pointing and pressing B to fire. This is a good multiplayer game which i don't really see my self playing on my own.
Find Mii is similar to the 'Wanted!' game on Super Mario 64 DS, in which you will be told what to look for, then point and press to select them, example of these are 'Find the Mii your using' and 'Find 2 look-a-likes'. This is a fun game which is very difficult.
Pose Mii gets your twisting the controller to fit your Mii into the bubble. It is a little disappoint, you find yourself not having any clue what to do first time you play it. In the later levels you have to change your shape with A and B as well as twist the Wiimote. Overall it turns out disappointing.
Billiards is disappoint too as if you are looking for a game of Pool or Snooker you that is not what your will find. Instead you get a game which tells you which ball to hit. You hit the ball by pointing at the cue ball and holding B pulling the Wiimote back and pushing forward. This works OK, the ball will spin depending on where you hit it, although it spins too much, and sometime when you hit the ball you hit it wrong and it goes no where.
Altogether Wii Play is not a Game to buy by it's self but since it come with a Wiimote, it is definately a need to buy.