The LOTR "extended editions" are terrible, with Saruman's death scene in particular. There's a huge difference between a "director's cut" and "uncut."
Donnie Darko had a pretty shitty alternative cut that tried to explain the logic of the movie (it was a good movie because it was fun trying to make sense of it). The worst offender was probably Mallrats uncut; the commentary track opens with Kevin Smith saying he DOES NOT want people watching said version of the movie because it's AWFUL, and sure enough it is.
Steam + PSN: PHJF