Let's make a list of NES games that were good but not very well known. I'll start.
Metal Storm
Awesome game, good graphics, large characters and funky colors. The best part is how you can flip gravity to help you get over certain areas. Not very difficult if you don't mind being killed by one hit but quite fun to play. I played it this week and it still looks nice. It would be a great Wii VC release.