I don't know what the sales data was for the 3DO, but I suspect that may be the biggest flop I own. *shrugs* Yeah, wasn't my favorite platform, but there were a surprising number of companies that got their start on the 3DO actually, and it had a handful of pretty noteworthy exclusives, including such examples as Total Eclipse and D, for instance. And Captain Quazar. You can't forget that masterpiece!
3DO also had the best versions of a number of avant-garde contemporaneous titles, like the best version of Out of This World (that's a.k.a. Another World for European gamers) for example.