Gosh, I thought it was a brilliant film. I can't argue with your assessment that the story was ridiculous, confusing, and depressing, but it was gripping as well. Sorry I can't help you with the Scottish accents; living overseas as I do I am accustomed to all sorts of accents. After seeing this film I've bought Irvine Welsh's novel and am reading it now.

They made it for US$5 million, reportedly. A lot of film for five million.