For PC because monitor distance is close 1080p with medium+ settings , with console because tv is 3 meter away i still play ps3 and xbox 360 games with no problem.
But i still play ps1, ps2, gamecube e.t.c. games on emulators so I guess i don't have big problem with graphics if the game is good.

I recently played Crash Bandicoot on PS1 and it didn't make me want to vomit in disgust.

I am fine with ASCII art or text based as long as it is enjoyable.

Any gen if the game is good. Anyway, if graphics are an important element, generally from late 5th or early 6th gen on (actually I mean the same period on PC, no distinct gen, but we can define the period throug console gens anyway, and PC-console multiplats were affected on PC too by console gens), particularly if 5th and 6th gen games received good graphics patches during successive gens, like Morrowind.

Exactly, it's not rendering at 320x240, like those games that to quote the "reviewers" back in the day, pushed the system to it's limit.

Crash Bandicoot is one of the few examples that has a form of bilinear filitering on the PS1 and is extremely low on geometry. In fact it looks fantastic today on emulators because of that. It's geometry is simple and scales in a lossless fashion in most areas.

That's the problem, those games that pushed the system to it's limit sacrificed render resolution and frame rate, much like Gran Turismo 2 vs Grand Turismo 1. GT1 was the more polished game and GT2 tried too hard and actually looked worse, though obviously expanded in lots of areas.

GT2 still didn't look too bad, but it was a downgrade for sure visually on a technical level. On a 21 inch CRT would you notice the resolution reduction, not so much but it was still immediately apparent to me, I can still remember doing the driving school in a mini and thinking to myself that.

I can't seem to find a list of PS1 game resolutions, but in the last year or so I've quite happily played other stuff like Spyro, Wipeout, Croc, Abe's Oddworld, and Tony Hawk. Not sure what res they are, but none of them made me upchuck.

I still enjoy FF I => VI so you can say I enjoy the game, graphic doesn't matter to me

Turns out your quite right.

Went and tried out a few and to be honest they aren't so bad and some of those insomniac/spyro type stuff actually looks top notch.

From what I tried, texture heavy games tend to look pants, also games like 3d on 2d/Resident evil etc especially frown inducing.

2D SNES is the cutoff and 3D PS3

I guess it helps that I grew up in the 90s, so I played a lot of PS1/N64 in my youth, and still play them to this day. I can see how it'd be hard on the eyes for those who grew up with the 6th/7th gen, or don't often play older systems.