The thing is when you watch Requiem For A Dream so much of it is taken up in the style - the fast editing. It is unsettling because it is unsettled, so to speak. It is about a loss of control in the face of addiction, and so the editing presents things as frantic and chaotic. Now that's great, but it means that there is an element of style over substance. I still think the substance of Requiem is sound, and it is horrible and bleak and all the rest of it, but nevertheless a large chunk of the effect comes from the style. Personally I think it's a bit hard to watch it without being caught up in looking at it from a production point of view, particularly when that is a chief selling point of the film and what everyone tells you about, so then you're watching "the film" rather than watching the film, if you get what I mean.