I've only been able to catch a half dozen of his films, but they are like nothing else I've seen in recent years. The way he edits films, seemingly taping from VCR to VCR to immitate the grainy quality of a film like The Cabinet of Dr. Caligari, is a quality I really admire among contemporary filmmakers. Not to mention his use of color and music to create a real sense of delirium.
For anyone interested in checking him out, I'd recommend screening The Dead Father first, before checking out Tales from Gimli Hospital, Careful, The Heart of the World, Dracula: Pages From a Virgin's Diary, and The Saddest Music in the World. If you get the DVD of Careful, there is an excellent Documentary short about his filmmaking style, which is a must for any fan.