NPD is great, reliable sales numbers are awesome considering the one thing that brought all of us to this site (regardless of whether it's why we still come) is sales.
But why is NPD such a massive thing? People on both side either rejoicing or in denial about Xbox One winning NPD November. NPD is very interesting and gives you an idea of the mindset of the North American buyer but that's about it. When it comes to sales on a meaningful level all 3 current gen consoles are WORLDWIDE consoles, you can pick and chose regions all you like but no one makes a massive fuss of 3DS being best selling in Japan because it's a worldwide machine.
I don't know if it's just me but saying "well the PS4 IS still easily winning worldwide" sounds like damage control when surely it should be the other way around where the statement of "well we won in x region" should be damage control..
Apologies in advance as I wrote this on my phone.