I'm an odd individual, so I prefer a game with originalty over amazing graphics. You'll more often find me playing an emulator than a Gran Turismo game. I saw this link on Fark the other day, and I couldn't believe how many of these ancient games are still fun to play. Of course, it helps that all this stuff is free.
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Don't brush this off. If you've never played these games you're missing out. It takes considerably more skill to play these than some Soul Calibur game that you spend fifty bucks on and beat the next day. I'm sure someone will laugh at the notion of going back to play these games, but those who laugh are the ones missing out.