Counterexample: I, personally, am in love with the "Trends" pie chart on mint.com. It allows you to drill down and expand each wedge of the pie into its sub-c

Counterexample: I, personally, am in love with the "Trends" pie chart on mint.com. It allows you to drill down and expand each wedge of the pie into its sub-components. I feel like this would be much less meaningful if it were expressed as, say, a bar graph.