Here's an on-point essay by David Ng about William Hung. It's from the Village Voice, but don't let that affect your perception.
http://www.villagevoice.com/issues/0414/ng.php
I've also seen articles critiquing the Hung-mania, and one of them has a serrating title, but he makes good points:
http://www.africana.com/columns/izra...040317hung.asp