The storyline in Super Mario Galaxy.
Horrible, horrible, Disney-inflected crap. I was really taken aback when I started playing - the melodrama, the affected cuteness was so far removed from the naturally fun SM64, and it felt like they'd taken all the terrible parts of Sunshine's wanky holiday storyline (which actually works out quite well/garners a few laughs in the end) and intensified them.
Anyway, it still proved to be the second best game released last year, although for the first hour or so I hated the hub-world, the 'ethereal'/weird princess, and even the music. It all felt very Hollywood. Bleurgh.