This class is so much more of a headache than it is worth. Somehow I would go to lectures and be more confused about various topics than just going into a topic with zero info. Like a typical Wu class, grade breakdown was 7% quizzes based on completion, 45% Homeworks (6 total, one of which was during finals week), and 48% Final. We received zero feedback after the 2nd homework before taking the final. Basically, you have no idea what you do or don't know or where you stand in the class. The final exam was also quite difficult and half of it was nothing like the previous quiz or homework questions.
I watched all of Prof Chen's 102c lectures on youtube before the final (HIGHLY RECOMMEND) and finally understood the course. It's clear to me the difference in teaching between the two professors, so I would try to take this course under another professor (if possible).

Bro just fired him

I had the misfortune of taking this class with Professor Wu. His lectures are incoherent and don't make much sense at all. Reading the textbook is much more valuable than the lectures. He is mildly helpful during OH, though he was 20-30 minutes late multiple times. He is a nice guy overall and I believe he wants the best for his students, but his teaching style is better suited for graduate courses.

Professor Wu is very nice, but his lectures are extremely unengaging and unclear. He recaps the previous lecture for at least 10-15 minutes every class, and then when he teaches new content, he half reads off the slides and half does some math without really explaining the big picture of when/how to use the methods being introduced.

The class is pretty challenging compared to the complexity of the content just because they are not presented very well. We did not receive ANY feedback for homework after homework 2, and none of the solutions were posted because "the exam is based heavily on the homework." Is that not the whole point of studying the homework? There is zero transparency in this class and Professor Wu's teaching model is to just lecture and assign work. There is no consideration for students' progress and whether or not the previous lessons were actually effective. The way he teaches was more suitable to an online course, since his lectures are so unclear I would've had to rewatch them multiple times just to understand the objective of the lecture.

I would have liked to look to the slides for help with homework, but the slides are equally unhelpful since they only contain the most basic algorithms and examples, but rarely information about how to apply them in different contexts. I also found the notation pretty confusing and I personally had to spend a lot of extra time watching Professor Chen's STATS 102C lectures (posted on Youtube) to understand the lecture and the intuition behind many of the sampling and integration methods. While I didn't mind the theoretical nature of the class (I found the proof based homework problems to be the easiest), I found it very difficult to understand any of the math when there was little explanation for its connection to what we were learning.

Since homework tended to be more complicated than lectures, I felt like I had to self-learn a lot using the textbook. In general, I don't recommend taking this class with Professor Wu if you have the choice, but if you find yourself with no other option, prepare yourself to dedicate a decent amount of time to just understanding the material and rereading the textbook.

Taking 102A and 102B with Wu was the worst decision I made in my three years at UCLA.

I took 102b with Wu 2022 spring but class is not listed so I'll say something here.

Don't take his class.

I got wrong on part of a small hw question. It got me 10% off the total hw. Prof doesn't use gradescope, so you have absolutely no idea how you got your points off. I went to ask TA for the correct solution, TA said go ask prof. I went to the prof. Prof said go ask TA.

Quizzes are also fcked up. Extremely unclear question prompt with millions of possible interpretations. Thought it's completion grade, it doesn't help to throw random garbage prompt just to waste students' time

Professor Wu is a really nice person. He would always love to help students by answering whatever questions they ask in class. However, it doesn't mean that this class is good. It's one of the worst classes that I have ever taken in my four-year college life. You can't learn anything from the lecture unless you are a genius. He doesn't use slides and only uses blackboards to write down all the stuff. The lecture was monotonous. It feels like his words enter your ears but never go to your brain, and I am sure that lots of students feel the same way as I did. The homework is hard as well. It requires you to write everything in R Markdown, including mathematical proofs, which is insanely hard if you are not a master of LaTeX. Exams are all multiple choice with a mix of conceptual and computational problems

Look, a lot of these reviews speak negatively about this class, and yes it is a very difficult class, but so are a lot of the statistics upper divisions. Professor Wu is extremely nice, and helpful, but the key to being successful in this class is to go to every lecture, and OH when you have a question. I had him for 102A, and 102C, got about ~40-60% on the tests, and still ended with an A. It is a super interesting class, and you do learn a lot. The exams are very hard, but the curve at the end is VERY generous to balance it out. The online quizzes he offers every week are graded based on completion at the end. He does this so you can do checkpoints on the chapters to see where you are. There are 5 homework assignments, and you have two weeks to do each of them but you can do them in two days. Overall, its a hard class, but I would take it again with Guani.

I envy the people who do not have to deal with the train wreck that is a Guani Wu class. You see the other reviews here. This class is so much more difficult than it should be. Wu is generally a nice guy but seems to be completely unaware of how to convey information and thinks it's sufficient to just go over trivial definitions in lecture slides and then test you on something that feels like it's not even from the same class. I had the misfortune of being forced to take him for both 102a and 102c and coincidentally both of these have been contenders for the worst classes I've taken in my four years here. I genuinely found stats 100c to be easier and more enjoyable which should add some perspective if you've taken that class. You would think after years of lecturing for the same classes Wu would be able to adapt or improve his ways or there would be some indication of self awareness on his part, but alas he keeps his consistently low ratings. This class isn't impossible but it's definitely not worth the effort that Wu makes it.

this man is genuinely evil.