Some lectures are spoken. Some are read. I suppose there’s something to be said for both. Here’s an observation on lecturing from Sir Lawrence Bragg (quoted in Science, 5 July 1996, p. 76):
“I feel so strongly about the wrongness of reading a lecture that my language may seem immoderate. … The spoken word and the written word are quite different arts. … I feel that to collect an audience and then read one’s material is like inviting a friend to go for a walk and asking him not to mind if you go alongside him in your car.”
I wonder what he might have said about lecturers reading the sentences on their PowerPoint slides to the audience?