All consoles overheat if left on long enough as do all computers or most thing electrical the overheat my friend got was pretty bad, in fact it killed his Wii which is why he has a second one. Still nintendo sent him the second wii for free as it was well within warranty my friend had apparently forgotten to turn his off properly and went work for the day came home after 12 hours of being out to his console smelling like burnt plastic and dust and well and truly dead. Perhaps a rare flaw but it's not like Nintendo will admit it or if they do it'll be subtle in it's announcement the fact the 360 can overheat was kinda announced quietly by the release of the extra cooling system which can clip on to it, companies never admit they've got problems with their product it's bad for sales.