71.7% - The speaker read the slides to us.
48.6% - Full sentences for text.
47.7% - Text too small to read.
36.9% - Visuals too complex.
As shown above, speakers reading slides is a recurring problem and ~2/3 to ~3/4 of participants were annoyed. On June 10th I also discussed this topic.
The image was adapted from a Puck magazine cartoon about If Moses came down today found at the Library of Congress.