Sure, the game barely scratches the surface of the instrument and its composition tools are pretty much useless, but the rhythm game contained within is fairly solid, has a strong selection of good classical music, is made all the more realistic and even a bit educational, thanks to the included piano peripheral.
Easy Piano is an excellent peripheral bundled with a disappointing game. It has a lot of solid content but it's presented through confusing music theory minigames, when the game should have put more focus on learning the basics.