Stenzel... haha. I went to every lecture during the first couple of weeks, and they were the biggest wastes of time. Like others have said, he goes off on a lot of tangents about things that will not be tested if you can understand him in lecture. He likes to mumble into the board a lot. If you have to take this professor for 1C, it's going to be manageable to pass the class, but not necessarily easy.

Stenzel is one of those professors that can't teach. He really wants his students to learn and understand, but he lacks the skills to do so. His lectures were frustrating and confusing. I sat through almost every single lecture understanding virtually nothing because he would go off on random stuff that wasn't even in the book, stuff that was definitely beyond the scope of the course.
The first two midterms were book questions, so they weren't that bad, but the final was terrible. He assumed that people that went to lecture would do better on the exams, but a lot of the people who never went to lecture got better scores than those who did.

Stenzel was without a doubt the worst professor I've had at UCLA. I went to every single lecture and still had to teach myself everything from the book. He taught everything in class differently than it was presented in the book and also extrapolated on the material and delved into topics that weren't in the book. For the first two midterms everything could be learned from the book but for the final he said that some of the things that he lectured on that weren't in the book were fair game. He told us if we didn't go to lecture or if we didn't understand our notes on it that we should google it. I googled one of the topics, didn't find anything that taught me how to do problems about it or even what a problem would even look like and then that problem was on the test and I had no idea what to do. Luckily I was able to get a B+ in the class but it took a TON of work. Avoid taking Stenzel no matter what.

Honestly, this was the worst physics professor I have had here at UCLA. In our physics 1c class, he taught us Maxwell's equations in differential form, and used mathematics that were well beyond anybody's head in the class. At a review session before the midterm, the TA asked who actually went to lectures, and most people raised their hands. When I asked how many of those people understood lecture, not a single person kept their hand in the air. I felt bad for the man because he seemed genuinely interested in his students' learning; however, he was completely out of touch with what his students were actually comprehending in lecture. He admitted that what he was teaching in lecture could not be found in the book and was not going to be on the midterm or the final, so it was superflous and unneccesary. As a physics major at this school I feel like I had to learn electricity and magnetism through the book alone, which does not allow for the full breadth of understanding needed to be competent at the next levels of physics analysis. Stay away from this professor unless you've taken, at a minimum, the Math 115 series and Math 134. And thats for Physics 1C!!