My first NES is at my mother's house. I plug it in every now and then when I visit so my son will have something to do. He's highly skilled at all of the Xbox360 games that come out, but he couldn't get even get past level 1-1 on Super Mario Bros.
Meanwhile, pops here was skipping worlds and finding all the hidden mushrooms.
Also played Baseball Simulator 1.000 (any NES baseball game that actually saved stats was AWESOME), Days of Thunder (one of the shittiest games of all time), Roger Rabbit (just frickin ridiculous), and Karate Kid (perhaps the most infuriating 3 levels you'll ever play).