There is an excellent essay at Don Vandergriff's blog about a horrible cyber weapon - the PowerPoint slide. In the essay T.X. Hammes analyzes how PowerPoint has weakened the [military] decision making process, as well as the ability to reason and write coherently. The main argument is that previously, staff had to provide a short, concise decision paper for the leader to read, think, discuss and decide, now the leader gets a barrage of information, very little time to think and discuss, and finally has to shoot a decision from the hip. However, he also makes a distinction that PP can serve as a very useful teaching tool.
I think the essay makes a valid point.