This should be in the Nintendo Past forum.
But yeah, I play tons of classic games. I never got to play the whole library of NES and SNES games, and I never owned a PS1, so I'm still finding new good games to play.
They're cheaper than the current gen games, and I think they're a great source of fun, especially if you're low on cash. Many are just as fun if not more fun than current gen games.