Could be the cover of a horror story
I shot this picture of my X-Box 360 controller while I was a bit bored and I was testing out the Auto ISO option in my D7000.
GameOn by
Patrick de Bie, on Flickr
50.0 mm
f/2.2 @ 1/40
ISO 560
Conclusion:
if you set the limits right, Auto ISO can be a great help if you don't have the time to constantly change all the settings (during concerts for example)!
But if you have the time, just pick your ISO by hand and fiddle with the rest of the settings.