It's tough, because 'at the time' some games look amazing yet others look pants on the same system, for example MGS2 was 60fps and looked insane graphically and had the physics/plot/gameplay to match, then you'd play other stuff and it'd look rubbish, and you'd know it wouldn't hold up in the future - which is why remasters/remakes I'm all for as it gives you more future replayability of the classics, graphics aren't everything and I'll happily replay old stuff still, stuff like snes/megadrive/gba etc etc is fine because it's SO worlds apart, especially being 2d side scrolling, but I'll never say no to a remake/remaster.
For example the MGS2 HD Remaster on the ps3 looks stupid good even now as does Snake eater, and MGS4 on the ps3 can definitely trade blows with a ps4 graphically - not fps wise sure but it looks insane, especially upscaled on an emulator...
Remakes/remasters are great cause it gives you the rose tinted glasses effect that the original did when it was that era/new and looks 'the best' for the time you're playing it in, so I'm all for them when done faithfully, which so far I have yet to find one to pick fault with.