Sega CD wasn't really a failure. It was profitable for Sega and there were a number of truly classic games for it: Dark Wizard, Lunar, Lunar 2, Snatcher, Vay, Popful Mail, Final Fight CD, Sonic CD, Shining Force CD, Keio Flying Squadron...it sold 6 million units, remarkably well for an add-on. It had tons of shovelware, tho.