There is a new trend on some Universities (in engineering and science majors), that professors show lecture slides over a video projector on the screen instead of writing on the chalkboard. They enter the hall, stay two hours totally passive before the students and read the slides aloud without explaining it. I even have had a mathematics course, in which the professor read the slides like a textbook without explaining them on the board or working examples.
Are you also affected? Which method do you think is more effective? What are the advantages and disadvantages of each? (I myself believe the chalkboard is much more effective.)