If you have a blackbelt in powerpoint, intellect and the creativity of an artist you can use powerpoint to effectively project your story or points. If however you use powerpoint to dumb down a complicated subject to a few bullet statements which provide on context, then every ill thing said about powerpoint is true.

While I agree with Tom's comment about being able to read a map, there is a powerful new information technology emerging in knowledge management called visual analytics, which I think will take decision briefs to a new level. It allows the briefer (or staff) to present and manipulate volumes of complex data visually in way that permits the audience to grasp complex relations without hours of study.

Of course you'll have to have a graduate degree in this technology to effectively use it, but let's not trip over the mouse turds.