I was just thinking the other day, what console, of all of them, was the biggest failure for a company.

You can answer that if you want, and you can answer these too if you want.

Biggest failures in the 1970's, 1980's, 1990's...
Biggest failures for Nintendo, Sega, Sony, Atari, NEC, Commodore.........etc...

By failure I mean, ruined the reputation, caused a great deal of financial trouble, sold horribly compared to the competition...

My personal opinion, I think the worst disaster for any system ever, would probably have to be either the Sega 32X or the Jaguar. Both hurt their respecitve companies' reputation.