The Nintendo Wii was a big departure from Nintendo's previous console, the GameCube. There was a drive away from always having to have much better graphics and instead focusing on the interaction device. It introduced a new motion controller the Wii Remote and Nun-Chuck. This opened the door to many new game styles and was adopted in PlayStation and Xbox controllers in the future.
The Wii was played by a much wider demographic of player. There are some unusual and brilliant games on the system. However, there are also a lot of poor quality games that were churned out to cash in on the popularity.