8.8: Since Mark isn't afraid of bashing beloved artists, this has happened many times. The most famous example is his review of AC/DC's Ballbreaker, which sparked furious comments from braindead fans.
His Miles Davis page. He outright admits he doesn't understand jazz, and thus can't appreciate Davis' music. That doesn't stop him from giving bad grades to classics such as "Kind of Blue".
Tear Jerker: His review of Bruce Springsteen's "The Rising" begins with a long, detailed description of what he and his then-wife were doing on September 11th when the towers fell. You can read it here. Bring tissues.