Strong disagree on NES games not aging well. Super Mario Bros, The Legend of Zelda, Mike Tyson's Punch-Out!!, Contra, Mega Man, Castlevania, Ninja Gaiden, Double Dragon II, and many others are just as enjoyable to play today for many people as they were in the 80's and early 90's. Millions of NES Classics were sold because of this. And, Nintendo has been able to resell those titles multiple times through Gameboy Advance, Wii, DS, 3DS, WiiU for the same reason. Many of them also have thriving hack/modding communities today, because of how many people enjoy playing some of those titles so much that they want to continue playing them but as new experiences. I myself was amazed recently to find that Tecmo Super Bowl has a community that has contributed so many roster updates that you can play almost any season in NFL history from 1958 to today. You can even play seasons as the CFL, or the defunct USFL and World Leagues.
Should I add "for me" then?
NES games already looked ugly and clunky for me even when I was a kid playing PS1 and N64
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.