According to NPD Wii U was doing better its first 6 months than the ps3 and 360 did in theirs
That's not true for either system and the PS3 had a terrible launch.
Lets put it this way.
The Wii U launched in November 2012 and in January 2013 it was already seeing monthly sales as low as 55k according to this article.
It took the PS3 until January 2014 to sell less than that in a single month and till May 2014 for the Xbox 360, which launched in 2006 and 2005 respectively.