Do you mean brutal like bad? If so I would say claire de lune only because it's over played, but it's still a beautiful piece, also I'm not fond of Jimbo's Lulliby, or Jardin sous la plui, and several of his preludes: Minstrels, Audience sur le Terrace de claire de lune or somethin like that, or pas sur le neige or fueille morte..
I do love his Cathderale Engloutie, Feux D'artifice, Hommage a Rameau as well as the rest of the images, and also Danse de Puck