Disturbing? Um.. The Cell could've been perceived as that.. Straw Dogs... Santa Sangre... okay, basically any Jodorowsky film.. Glitter.. Cube.. etc.
As for controversial... Irreversible is definitely the most talked about controversial film of recent memory that I know of.. and, naturally, I could see why... but nevertheless - it was a form of art.
I remember American Psycho as being hailed as controversial... Oh, and Howard the Duck was seen as controversial. For sucking so much.