Well I don't have long on the computer but.
Honestly people saying Reggie is just spinning it to sound good and Nintendo actually failed. Thats absurd Nintendo stated themselves that they weren't going to push the 3DS hard. They stated that their would be plenty of supply. Don't believe me look at the Ad campaign? With Wii the campaign was over 500-million dollars strong and the origional DS was huge too.
Where is the 3DS huge campagn? Infact many casual I know didn't even know the 3DS existed till I told them. Well DS had ads in old folks magazines, fashion magazines, womens magazines. All over TV regardless of channel and huge hitting casual properties to boost sales.
For 3DS Nintendo went the silent route, sure Reggie went to a couple talk shows and their are a few TV commercials. But guess what Kinect is advertised more then 3DS I see about five Kinect Commercials for every one 3DS commercial.
So if Nintendo really expected to sell out and failed to do so, that would be extremely odd. Nintendo knew this would be the out come from the beginning. Also 400,000 as others have said for week one isn't half bad. Sure its not as good as Kinect's sales during Christmas last year. But its still fairly good for Nintendo.
Honestly when Nintendo pumps that 500-million dollar ad campaign behind the 3DS like Microsoft did with Kinect or Nintendo pretty much did with Wii. Then we can say 400,000 isn't that great. But until then this is fairly good.