Is there anything worse than bad graphics? No, really. If you're going to spend dozens of hours looking at something, might as well not make it an abomination.
Having good graphics isn't just about tossing a bunch of high number of polygons on the screen, though. It's also about design, and how a game can present the world in a way that is easily readable by the eyes.
VideoGameDunkey has a brand new episode that looks into graphical design and why some games look... much better than others. Check it out: