NES is good to me.

Its about the gameplay and fun of the game.

PS1.

It really depends. I still play Tetris on my smartphone on an almost daily base. But I can give you this, 2D games age far better than 3D. Many SNES and even NES games are still good to look at to this day, but some PS2 games looks terrible.

Lol. 10-12% of people only plays current to nextgen games.

it's a strange way to put it, some early 3D games are still good looking (look at Doom, or Virtua Racing, or even Daytona USA ARCADE, S.T.U.N runner is still something to look at as well) or even some early 2D games, like Donkey Kong, Pac Man... in their arcade incarnation.. none of these is an eye shore!

Obviously, I like what devs do with current hardware, and I can't wait to see games like Horison Zero Dawn on the PS4 Pro next year  

It's all about the art

On the other hand though, about 60% of voters say they're fine with 6th gen graphics or lower, which is nice to see. ;)

I'm one of them.

Although I have to admit that I play the Infocom text adventures in higher resolution nowadays:

Don't really care about graphics.

Though I will say that I think some early PS2/Xbox/Gamecube games can look pretty muddy.