I'm not discounting your right to have a personal opinion. I'm just countering that there are millions of people who don't have any problem with the graphics and gameplay of many NES titles. It's the reason the NES Classic sold so well to the point of being almost impossible to find, while the PlayStation Classic was being discounted into the bargain bin a month after release.
Millions is a overstatement, there are some hundred thousand people who enjoy NES til this day still. It's a classic and part of the childhood of people who started playing games in the 70's and 80's. While kids from the 90's don't have nearly as much love for 64, Saturn and PS1 era.
I actually think this is much more a difference in culture and how games are consumed for different age audiences. I'm a kid of the 90's and I have no interest whatsoever for either PS classic or NES classic
If you ask me whether I like more PS1 or NES, then I would easily say PS1. I would like to play some of their games if they were available on some cheap subscription service, but would never buy a Console specifically made to play them