The X series took the original 8-bit and made it ten times better. The first Megaman X that debuted on the SNES matured Megaman and gave him balls. Armor upgrades, heart tanks, "Shierokun", Sigma, bosses with real names instead of "man" on the end of it--all of these little new enhancements is what brought more meat to the table. Sure, most of the names were still goofy, but at least it was somewhat fresh. And Sigma had much extravagant and different alternative forms then what Wily can remember.