Virtual Boy flopped due to not being portable and poor marketing.
The argument about cd format..
The 3DO flopped due to price tag and lack of anything beyond FMV games. I know, I own one. A $700 dollar price tag and lack of good games, it\'ll kill any system.
The Jaguar CD flopped due to being an ADD-ON to an already existing console, not only that, but a console that was in piss-poor shape.. I know, I own one.
The SEGA CD, was nothing more than an add-on, the first of two. As for the Saturn, it flopped due to a price tag and a botched launch...I know, I own both.
Nintendo played it "partially conserative" due to their anti-piracy views, something they stuck by when they moved to the Cube format.
Oh and the CD-I, yeah it just sucked...