You've summoned the advice page on !piec. There are issues with Pie/Doughnut charts that are frequently overlooked, especially among Excel users and beginners. Here's what some experts have to say about the subject:

• In Save the Pies for Dessert, Stephen Few argues that, with a single rare exception, the data is better represented with a bar chart. In addition to this, humans are terrible at perceiving circular area.
• ExcelCharts argues that the pie chart is simply a single stacked bar in polar coordinates, and that there are many pitfalls to using this type of visualization. In addition, the author also argues that pie charts are better displayed as bar charts instead.
• Edward Tufte, data viz thought leader, states about pie charts "A table is nearly always better than a dumb pie chart; the only worse design than a pie chart is several of them, for then the viewer is asked to compare quantities located in spatial disarray both within and between charts [...]. Given their low density and failure to order numbers along a visual dimension, pie charts should never be used." (excerpt from The Visual Display of Quantitative Information).
• Cole Knaflic in this article rants about her hate of pie charts, and boldly states they should not be used.
• Joey Cherdarchuk in this article shows how easily pies can be easily replaced by bar charts.

If you absolutely must use a pie, please consider the following:

• Avoid using too many classes. And order your classes, too.
• Try to follow Randy's Correct Ways to Use a Pie
• Avoid the third dimension. Summon my help page !3D if you want more information.
• Avoid exploding slices, and use a direct label instead of a legend.

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Interesting points - I appreciate the feedback.