Izo is the sort of movie-thing that straddles the line between awesomeness, pretentiousness, and an as of yet unidentified third sector that cannot be described with human language.
So this time-traveling samurai dude kills a ton of people, and along the way this other dude sings nonsensical things for ten minutes at a time while sounding like he's just eaten a cat who was itself gargling nails. There's also some possibly gratuitous nudity and some certainly gratuitous scenes of swords appearing from places where they should probably not appear from.
I only have about half of an idea what Izo is about, but I think it means that Takashi Miike hates everything except slimy grown men being forced out of tiny female orifices at the ends of movies. And personally, I love him for it.