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UnderwaterFunktown said:

Probably the last two Xbox's. I know "unsuccessful" is relative, but I'd say they more or less fit the bill, but luckily they're easy to develop for when you're already making a PS version.

Once you hit the 30 million consoles sold mark you no longer can be called unsuccessful.  The Atari 2600 was the first successful console, and it barely hit the 30 million units sold mark.  Heck once you hit the 20 million mark you hit the semi successful mark.  You can also sell under 20 million and be semi successful since the Saturn and PC Engine were successful in Japan but not very successful anywhere else.