The game has been in the making for a while so the graphics are not up to today's standard.,

We want the game to essentially look like you're playing a painting. Everything is 3D, but the textures and ways that scenes are built are intended to give the look of a painted scene. Some games go for realism with a lot of shaders and high poly counts, that's just not our intent with the visual style. We want it to be a timeless aesthetic because we expect people are going to be playing for a long time. Looking back at cutting edge games even a few years ago and they don't tend to hold up very well, but for Diablo we want it to be as visually pleasing 10 years from now as it is the first time you play it.

Even videos really don't do the beauty of the game justice. I think anyone that's sat down to play can attest to that.