I wrote many powerpoint files and held dozens of presentations.

It's not inherently bad, it's really about the people.


The one thing that is certainly bad is the emphasis that some people have on nice graphics, corporate design, badges, insignia and other non-information content of the slides. A simple, eye-pleasing background fading from strong colour top left to light colour bottom right and an indication about the source/author on every slide is enough. Advanced decorations as in medieval bibles is simply waste of resources and distracting.