I got him for Life Science 4 in the Spring 2009. I agree that his materials are rarely related to the final exam. He asked for the minuscule facts in his dense and compact lecture notes. I got over 90% which was an A on the first exam with Dr. Pyle, and after taking the final of Dr. Wall, my grade dropped dramatically. The final exam was really confusing and maybe require you to deeply understand his confusing material. He spent quite a great amount time talking about Charles Darwin, his favorite biologist, in the beginning of the class that didn't help much in the final. Then he spent another half time to go over the previous lecture. For the new lecture, he just only went over by reading off the slides really quickly that I didn't think anybody could really completely understand what he meant. Moreover, he didn't care if anybody understand the materials or not. When asking him about the materials after class, he would talk about something else that you don't necessary need to know for the class. Avoid him if possible!!!