Super Mario Brothers definitely has its place but the NES's true selling point was A) the arcade ports and B) Nintendo's business practices forbid anyone from putting said arcade ports on a competing console for a year and some change. As shark-like and monopolizing as Nintendo was in the 80s, it meant that competition had to carve out a name or die. Sega became known for their unrivaled sports titles with EAs help and NEC became known (in Japan) for the superior graphics and tech. It's ironic that Nintendo's business practices, which were intended to secure them at the #1 spot, pushed developers to try harder which in turn created a stronger market.