I will soon. So perhaps I am wrong. But perfect scores to me indicate a perfect game, or a near perfect game.
A game that on purpose hobbles its graphics to look retro, is not perfect. It looks like crap, much of it. Some of it looks cool, but a lot doesn't. Since it doesn't look good, forget perfect, I think perfect scores for such a game are excessive.
Perfect scores should be used more sparingly. I thinks its because most of these reviewers are overaged fat and white, so they are letting nostalgia get in the way.
And we all judge graphics. We all have a line the sand for such games. If it were even more rudimentary, would people still be impressed? No. So my line in the sand is just different from yours, but we both have it. So at the end of the day we are the same. But I am perhaps just more honest, and less beholden to nostalgia, and more concerned with 'good'.