Firstly, the main article is comparing two SONY products (not Ninty vs Sony as you said), one of which is the newer version of the other. The PSV's predecessor is currently selling better than the PSV. What the fuck has the combined sales of the Wii, DSi XL and DSi got to do with the PSV? You're not including the 3DS which is Ninty's newest handheld which is by far outselling the Vita at the moment. Thus it's to be expected that the Wii and DSis are not going to sell much, for the WiiU is coming out this year and the 3DS is merely £30 more than a DSi XL, making it a much better deal.
Learn to read and post stuff relevant to the article rather than start hating on Ninty at the first opportunity.