GameInformer has conducted a survey recently on new generation console failure rate, and here are the results:
PS3: 10.3 %
Wii: 6.8%
Xbox 360: A whopping 54.2%
Congrats Microsoft on the new milestone.
Link to Article:
http://www.joystiq.com/2009/08/17/game-informer-xbox-360-at-54-2-percent-failure-rate/