Agreed. The interesting point is always when is X the right tool for the job.
Pie charts is a good tool when you want to show the relative sizes of (a small number of) unordered data points. It is a bad tool for displaying Word features introduced per version, since it is not really interesting to see how many features were introduced in Word 2.0 relative to Word 95. (Never mind that "number of features" is pretty hard to quantify.)
A pie chart would be interesting to show e.g. the market share of Word compared to OpenOffice.
Pie charts is a good tool when you want to show the relative sizes of (a small number of) unordered data points. It is a bad tool for displaying Word features introduced per version, since it is not really interesting to see how many features were introduced in Word 2.0 relative to Word 95. (Never mind that "number of features" is pretty hard to quantify.)
A pie chart would be interesting to show e.g. the market share of Word compared to OpenOffice.