i really love Beyond the Black Rainbow for what it is. I don't understand all of the vitriolic opinions of it, but I think "Mandy" will change a lot of people's views of his work.
i read an interview where he said he wanted to make a movie based on all of the horror and sci fi VHS covers he would see in the video store as a kid. Having never actually seen the movies (his parents wouldn't let him), Beyond the Black Rainbow was the movie he imagined in his head. It made a lot more sense to me once I read that.