Those good games had huge droughts.
The PS3 and Xbox 360 had better games and better support.
Wii U offered a worse experience in every way that mattered and still cost more (the console AND the games)
It wasn't a leap that people were expecting for an 8th gen console and often was a step back from 6th gen hardware.
I pre-ordered mine and loved it but I had the PlayStation and Xbox to pad things out during the dry spells. It just wasn't a good device despite good games.