There are some great games on NES but many of them are done better with their sequels on the SNES.
- Megaman 2/3
- Castlevania
- Probotector
- The Legend of Zelda (and II)
- Dr. Mario (I still play with my Dad - and I'm 27).
- Adventures of Lolo 3
- Ducktales
- Chip & Dale
- Rockin' Cats
- R.C. Pro-Am
- Willow
- Metroid
- Mike Tyson's Punch-Out!!
- Little Nemo: The Dream Master
- Final Fantasy (although NTSC, it's easy to mod the region-lock chip to play all regions).
Super Mario Bros 2 are interesting and well worth playing. Don´t go dissing on it just because it has that Doki Doki Panic stamp on it... maybe you don´t know the whole story... You could argue for Allstar version on snes but the gameplay is the same and the graphics are very good on NES too.
All the Megamans deserve a playthrough or at least they should be given a chance.
Zelda 2 is actually more interesting than Zelda 1 because Zelda 3 on SNES does everything so much better than 1. It´s a different sort of game and they never did another Zelda quite like Z2.
Ducktales and Chip & Dale are absolute classics.
I don´t bother with Metroid because the snes game is again superior.
Punch Out on NES is actually a lot better than the SNES and arcade versions. There´s just a definite charm about its graphics style and gameplay on the NES. But then why doesnt this apply to Zelda 1 and Metroid? Because my opinions are not subjective, they are the TRUTH

:roll:
R.C. Pro am and Ironman Stewarts Super Off Road are fun for a while but I like games with more defined goals more.
Probotector/Contra I never liked, dunno why.