3DO or quite controversially the PS2, my arguement for that is it had lots of good games (MGS2, GTA, FFX etc...) but thousands of crap ones that took a guy in his basement a few weeks to make.
But don't get me wrong the PS2 had some killer games just that ratio of good to bad was 1 - 10 because it was so cheap to develop for.
P.S. please dont flamewar about my opinion because thats all it is