Wii U has a knack for having certain games with REAAAALLLY high attach rates.
I am a big Nintendo fan-- Despite how much they hurt me with Wii, and how much they hurt me with what they did to Metroid, I still just like the Nintendo stuff. I love Smash Bros and Mario Kart and Mario Maker etc. I was just thinking the other day about how I want to play Mario 3D World. I never finished it.
It's pretty crazy how successful the software has been on the Wii U, can't even imagine what the software sales would look like when attached to a successful console.