Hardware
I really digged the controls of the Wii when I first saw it, the IR + nunchuck design clicked for me and it's the reason why I bought a console after two generations of missing out.
Games
The new experiences started with games like Trauma Center and Zack & Wiki which used the controls in imaginative ways. Had first full plate of 3D Mario later that year with the awesome Super Mario Galaxy. Later had my first Wii FPS with Metroid Prime 3, the balance board We Ski & Snowboard, the inexplicable Munchables and our dance craze started round this time with We Cheer. During the next years I got my fill from cheap old games, music/party games, etc; moving to the gyro controls of motion plus and its games.
Worst
Finding out about regions, localizations, etc. Thought that by this generation things would be more global.
WTF
Wii losing steam thanks to its game release schedule.
