Because I believe she is singlehandedly responsible for one of the worst atrocities in all of musical history. The effing Diva-style obsession with stretching one word into 100 useless notes, like an 80's Poison wank guitar solo.
Now because of Ms. Houston, these divas can't even sing a melody. They just masterbate with vocal exercises. AAAaarrggg!! The drugs didn't even help her.

