I don't usually mind the low quality stuff but it irks me when the art is absolutely amazing and adds to the panels only to get butchered by cheapskate companies adapting it terribly. It's a tragedy for junji ito cause those ten hours of etching the shadows in any given page do actually matter to add to the horror and the feeling of wrongness. Only to be spit on by shit executives not giving a fuck and just having the animators use a fucking paint bucket to shadow.
Look at this image. The right side is a demon who you wouldn't wanna meet and the left is just a granny with bad ache.