If WiiFit's "job" was to turn the world from a bunch of lazy slobs who sit on their couch all day - into muscle clad, yoga mastering supermen/women - then hell yeah, its failed ;)
But in terms of being a successful "controller", and a product that sells well on the market... I wouldn't think it has "failed" at all. Its failed when someone can head into any games store, and see hundreds of WiiFit units unsold.
I'm about to jump on now, for my daily session before heading to work...
Gesta Non Verba
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Wii code: 2263 4706 2910 1099