Firstly this isn't a software question so this type of polling is probably best suited to another forum.
Secondly there isn't any possible way a person could answer your question as it's too subjective.
Just to give you an example, I would list commando as one of the worst looking games ever. Given it's time frame the game had technology available to make it look really good. What we got were a player sprit that looks and moves exactly like enemy sprite and levels made up of 6 to 8 tiles just thrown down at random. Also animations of 3-5 frames per character, which is just laughable.
For me games couldn't have good graphics until the early 90's anyway, when there was enough space on the boards to make stuff actually look like stuff, instead of some super-deformed pixelated icons that suggest what the character is supposed to be. Also animation. Good animation is key.
I think the first example of a game that really looked good would be Final Fight. Each character looked different and had different animations. Each level looked different. Not only that but the levels had detail in them and things were there just for asthetics, rather than a platform to jump on or a crate to break. It was the first game where as much time was spent on how the game looks as the gameplay contianed in the game.
Also I don't really see the point in the question. If you are wanting to play games because of how they look you sure found the wrong forum. I think brophog and horseboy's tounge-in-cheek replies kind of elude to that fact.
