What criticism do people make about the death growl vocal technique?

A death growl, or simply growl, is an extended vocal technique usually employed in extreme styles of music, particularly in death metal and other extreme subgenres of heavy metal music. Death growl vocals are sometimes criticized for their "ugliness", but their unintelligibility contributes to death metal's abrasive style and often dark and obscene subject matter.

The death growl vocal technique is described as having a harsh tone which is called ugly.