This week, Tushar Mehta posted about his Custom Radar Chart add-in on the Daily Dose of Excel blog. These are also known as Spider charts, and I’ve never created one, except as a demo in an Excel class, when someone asked about them. It probably looked like the one shown below, or the Excel 97 version of that.
Radar charts can be tough to interpret, and Excel chart expert, Jon Peltier, suggests several alternative chart types that you can use, instead of a radar chart.
Despite the controversy, I was surprise to find this radar chart / spider chart while wandering the streets today. It might not be an effective way to present data, but it does make a nice roof!
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And your example simply illustrates my point: these are very hard to read.