The Legend of Zelda: Skyward Sword.
I played this game for, maybe, two days before I was completely torn away from it by work, responsibilities, family, life in general, etc, and have never even attempted to play it since. Now that I've dusted off my Wii U and have played and finished several classic Wii games, I figured that I might as well attempt to play this through to the end and see how good this game stacks up in the Zelda series. Just looking at the reviews and the multiple perfect 10 scores makes me excited to play this, but I do remember that the beginning of this game is PAINFULLY slow and the Wii Motion Plus controller is a pain in the ass to have to continuously recalibrate.