Sure I can understand that a lot of people can't handle any music that isn't song with clean vocals (I call them philistines)
Im not a Tom waits fan and some of the greatest vocalists (Billie, Frank) didnt necessarily have the greatest range. But on other hand you wouldnt want to hear Charlie drake singing Le Boheme
Ive always been cool towards some artists who can clearly write but have godawful voices IMO (Van morrison, Bob Dylan and especially David Bowie)
But im a soulboy at heart and you cannot get close to sam cooke, Marvin, luther