Ok so maybe I lied, Majora's Mask is still better but I have to say Wii Fit is probably Nintendo's greatest creation in a long time.
My mom got the game for Christmas, and since I was gone to college I didn't have much time to try it out, now that it's summer break I decided to give it a go and see what all the hype is about. And WOW, I started with strength exercices to see if it can beat my own personal workout routine (of bench pressing) and the pacing is fantastic, I know it's only a virtual trainer but it really helps to have someone telling you the right pacing.
Then I went to the aerobics training (holla-hoop), and on my first go I got the highest score that my family had set, but still not 4 stars, so I tried again and again and again until I finally got the high score and only after I got that coveted 4 star rating did I realise the game tricked me into exercising so much! This is the hidden secret of Wii Fit, it makes working out fun and addiciting and is the best game of all time, after Majora's Mask.