In an interview with Forbes, Reggie Fils-Aime spoke about the Wii U. When asked how the Wii U will compete against the PS4 and Xbox One thanks to the differences in processing power, he said...
http://www.gamerevolution.com/news/reggie-filsaime-points-to-ps2-in-defense-of-wii-u-power-20195"The processing power of the hardware really doesn't matter. I say that with confidence looking at the most recent generation of home consoles where the Wii, which the broad industry looked at and said "boy, that seems to be underpowered" but sold 100 million units globally. And the consumer saw the innovation of the Wii Remote and the active gameplay we offered.
Even if you look at the generation before that, it was Sony's product that was underpowered compared to the other two home consoles and yet they won that generation. In the end it comes down to the games. The games drive the install base, the games excite the consumer. We feel excited about the games not just from a first party perspective, But from third party as well."