Everyone has an opinion about graphs and charts. “That’s beautiful!” “That’s misleading!” But few people have precise language to describe what they like or don’t like about data visualization. Drawing on ten years producing the Junk Charts blog (https://junkcharts.typepad.com), the premier source of online dataviz criticism, I have developed the Trifecta Checkup framework for appreciating data graphics. This framework also serves a guide for improving one’s charts, as good artists must develop a discriminating eye for the strengths and weaknesses of artwork.