Most of the people I ask don't even realize that that the Wii U is different than the Wii. They think it's just a gamepad accessory for the Wii and don't understand that it's a different console. Really a shame.
Nintendo has always had trouble connecting with American audiences -- when they've done so, it's been basically by accident. It seems that while they like American money, they still build their products exclusively with the Japanese market in mind.
The GameCube is a similar tale of woe, a vastly underrated system that came in last entirely due to superficial considerations, like being purple.