While game companies like Nintendo have been bringing back their classic consoles, the industry has a very selective memory. Not all of the consoles we owned growing up were global hits. In fact, we spent hours playing games on these 10 forgotten systems:1. Sega DreamcastPolygonAh, take your mind back to just before this console's famous 9/9/99 release date. Remember how excited you were? The console's 32-bit graphics were quickly overshadowed by the PlayStation 2, especially since the Dreamcast was launched with barely any great games.While the console was later home to hits like Sonic Adventure, Shen