Perhaps some, er, context is needed here.
Manga UK, the company behind the release of Overfiend, pulled off a move of marketing brilliance by having Overfiend shown in theatres. Once you've done that all you need to do is wait for some tabloid journalist (by which I mean, someone who writes for the largely conservative press that covers celebrity sex scandals and is read by a huge swathe of the population) to see the film, wait for them to write an article about how "this outrageous filth should be BANNED" and then wait for people to flock to the movie. Even better, politicians were calling for it to be banned in the Houses of Parliament. I mean, you can't get much better free press then that.
Of course, all this had the knock-on effect of tarnishing the image of anime in the UK, but it certainly worked well for Manga UK.
Legend of the overfiend made it on the list of top 100 best cartoons/animated films ever on channel 4.
http://video.google.com/videoplay?docid=-1780098464739041775
I think it ranked around 70
also Wicked City made the list.