Why is it that Wii U's name failed it but Xbox One's didn't?

[Miyamotoo]

Wii
Wii U

Xbox 360
Xbox One

Not a exact same thing, expect that,
Wii U had very poor and bad marketing, Nintendo always showed Wii U gamepad in first place and not console itself (that looks very similar to Wii), thats why many assuming that tablet controller is just an add-on for Wii.