@daveparadi, thanks for the link to the survey but I find it a little odd. 48% can't read the text because it's so small and 33% have trouble seeing the slide because of the poor colour choice. Many of those would also in the group complaining about having the slides read out. Wouldn't they want that? ;-)
Mind you, most of the presentations I've been to had all the faults but, in addition, the presenter spoke too softly to be heard.