Angry birds is a beautiful game.
The game uses an amazing engine in which the user can fling a bird across a level to break down the environment and kill some enemy pigs.
The game is very easy to pick up, and has an amazing atmosphere whilst playing this game. The controls while using the kinect are amazing, they're easy, flexible and doesn't get in the way like using a controller.
The gameplay involves flinging birds accross a level so that the birds will break the environment and kill the evil pigs. The game is as much challenging as it is reqarding, once you've completed a certain set of levels you are rewarded or find out a new type of bird which involve speed, explosions and bigger and badder birds.
In conclusion, I think this game is very fun to play, there are lots on minigames and sidequests alongside beating the game as a whole. I would definitely recommend a family buying this and using it with their kinect because it is a great bonding experience too playing with the family.