We've all got them in our PowerPoint slides - copy and paste from excel and present the data! The three basic flaws with doing this is (1) they look ugly, (2) they may not be the best representative chart type to go with the data and (3) most people forget to bring meaning to the data they are presenting.
These skills are not intuitive; they rely largely on analysis and presentation skills that must be learned. One online quiz goes on to examine if people really know what chart types to use with some good examples - click on Graph Design I.Q. Test. It's a fun way to demonstrate your graph design prowess or help your colleagues see the differences between good and bad design. You can read more about data visualisation (and I'll be sure to feature it more in this blog) at Perceptual Edge.