This noted in a report at GameDaily?

"Yesterday we were tipped off by an employee of a major publisher who claimed that the Xbox 360 failure rate at least within his studio has been much higher than Microsoft has stated failure rates to be (around 3-5%). The employee suggested that the failure rates were actually as high as 30-50% among the 300 or so consoles they received. He also noted that Capcom's Dead Rising seemed to be making the problem worse, with many of the consoles getting much hotter than usual."

While 30 - 50% seems high, 3-5% seems awfully low given the amount of complaints I hear everwhere about system failures.