I loved the old Nintendo games. The first game is the first video game I remember actually beating, even before Mario. When I was a kid, I didn't like Simon's Quest because of how much different it was, but as I got older it became one of my favorites because of it's RPG elements.
I haven't played many of the newer games after the SNES and Genesis era. I always start, but can't get into them because I've missed so much and don't understand how they all tie with the older ones.