According to the Fake Steve Jobs Blog, Vistaster is defined as
VISTASTER. n. a giant cluster-f**k; a colossal mistake; a turning point, inflection point, or event that, in retrospect, turns out to have led to the doom and demise of a once-powerful company, person or organization, eg., "Have you seen Speed Racer? It's a total vistaster."
You know its a truly disastrous product when it forms its own word. Just like the Ford Edzell. Nice.