I only know one person in real life who owns a Wii U. My eleven year old nephew. So I've played some Wii U games using his system. Never been too impressed.
Anyway, one of the games he owns is Splatoon. The last time I saw him, he was playing an arena shooter, but it wasn't Splatoon. He was playing Pixel Gun 3D on his Android tablet. I asked him why he was playing Pixel Gun World instead of Splatoon. He said Pixel Gun World was better, because you got to shoot real bullets.

Regardless of his reasoning, he was having more fun playing a free mobile game on an $80 Android tablet, than he did playing a $49.99 game on a $299.00 console.
Draw whatever inferences you will, but if I were a parent of younger kids I know where my money would go.