Player2 on 23 December 2012
Nintendo never attracted a big amount of the long time gamers (let's call them that) in the home console market in Europe. The Wii won here last gen because it created a new audience. The Wii U isn't a product designed for this new audience so the sales suffer.
Certain games (Mario Kart, Wii Sports) can improve the situation.
Economical reasons don't explain well why PS3 is selling way more with a slightly lower price (specially when I see that the GT5 and FIFA 13 500GB PS3 bundles for 300euros are the ones sold out), and those Polish stores pics doesn't explain why the Wii is outselling the Wii U.
