Is Splatoon the system-defining game Wii U will be remembered for?

[NoirSon]

In Japan probably, but on a global scale, I don't think that would be accurate. Great game has done wonders but it really hasn't defined or shaped anything other then being very successful, I think Mario Kart 8 or Super Smash Bros. for Wii U are representative for the Wii U's life cycle.