Show me a 30 minute clip of Sony drunk on its own success at E3 during the PS2 dynasty and I'll agree this is industry standard.
Are you nuts? Sony practically
defined arrogance in the console industry (I guess they're toeing a slightly more humble line recently, but that's only because they've been smacked, very, very hard).
Remember Kutaragi? The guy who led SCE for most of its successful years? He was well known mostly for being hugely, insanely, mind-boggingly, arrogant, to the extent that many even at Sony hated his guts (I know this from friends who worked at SCE in Tokyo); SCE was a bizarre and insular division within the larger company, but hard to control because they made so much money. In the end, he went too far, and the poor showing of the PS3 gave Sony an opening to get rid of him.
Nintendo seems refreshingly straight-forward and humble compared to all that crap (remember "get a second job to afford a ps3"?). They certainly are happy to be doing well, but they aren't completely wacko like Sony was.