Mike's stats 20 is a fantastic class to me. I learned a lot about R language, and I also learned a lot from How Mike cares about his students. Go and take this class with no hesitation, and you will gain far more than you can imagine. At UCLA, it's really hard to find a professor that cares students so much, and luckily, Mike is one of them. I will keep the following quotes in mind:
"We need to remember what's important in life: friends, waffles, work. Or waffles, friends, work. Doesn't matter, but work is third." ― Leslie Knope.

Very nice professor. Always answers students' questions on campuswire. Tests are ok. Very easy A+.

Don't be scared about taking this class! I was nervous going in based on prior reviews, but this class has been restructured a bit from the ~dark days~ mentioned by some other reviews and is not anything to fear.

That being said, I would not say this is an easy class per se, but if you go to lecture and do the homework (even though they are for completion, if it definitely worth your while to dedicate a significant portion of time to really trying each problem), as well as go to office hours for things you are unsure about, you can succeed in this class.

Professor Mike is truly one of the kindest professors I have had, and cares a lot about your success both in the course (i.e. understanding R) and overall. He dedicates a lot of time via office hours and on campuswire helping out students, and emphasizes prioritizing your mental health over grades, which I appreciate. Also!! Exams are less difficult than homework, so don't freak out if the homework takes you hours upon hours; exam questions will test similar info but the solutions can often be done somewhat simply.

DR. MIKE IS F--ING AWESOME! TAKE THIS CLASS, YOU WILL NOT REGRET IT! The old Bruinwalk reviews scared me, so I really hesitated to join this class. However, Dr. Mike is quite literally one of the sweetest, most empathetic, fun Profs I have ever met. He made a lot of adjustments to his curriculum in light of his student feedback.

He knows his lectures like the back of his hand and creates these organized pdfs of the material. His class was also really engaging and he managed to make me laugh in each lecture. He also teaches in a way where you can just focus on your learning without being concerned about your grade. I never found myself stressed or incentivized to cheat to do well.

The homework, while challenging, is graded on completion. The exams are quite difficult, but he curves generously so it doesn't really matter in the end. Just focus on trying to learn from mistakes you make on past exams. A study hack for this class is to also play around with R commands and see how outputs change depending on different types of inputs. He literally gives you all the resources you need for the class condensed on his pdfs, so Stack overflow is entirely useless and exams never have surprises on them. You will leave this class with a foundational knowledge of R that will help you loads in the future.

Dr. Mike also makes himself super available to his students. He has extensive office hours and is eager to answer all questions that come his way. He also places a strong emphasis on the importance of mental health and he cares about his students deeply.

Seriously, this class is fantastic. Ignore the other reviews, you'll be in great hands :)

mickey mouse class if you have any logical reasoning

Here to boost Mike's Bruinwalk rating. He's the one who designed the current Stats 20 course, and it is really one of the best introductory programming courses I have ever taken (considering I have learnt 6 programming languages in total). He's pretty much online 24/7 on Campuswire constantly answering our questions, which shows how much he cares about our learning. His lectures and lecture notes are clear and concise, which really helps in revision for exams. Though homework assignments are time-consuming, the problems are well-crafted and really fun to work on. If you are a big fan of programming, I would highly encourage you to attempt the optional advanced problems. Although exams are fairly challenging, just be familiar with potential traps / edge cases that Mike goes through during lectures, as well as the family of apply functions that he loves testing on. His curve is extremely generous too, so do not worry too much if you did not perform as well for exams. I would highly recommend taking Stats 20 with Mike, he lays a really solid foundation for you in R.

This class is as horrible as everyone else mentioned here. However, this quarter I had a great grader, who points out my errors but gives full credit to my homework. Btw, I completed all parts of the homework and at least wrote complete code, and the graders just grade on completeness instead of correctness. BUT it is just so hard to write complete code. Thus, a nice grader seems great, but it also requires a large amount of time spent on homework.
Finally Mike seemed to give us grades generously, since I was between 25-50 percentile for most exams but still get an A.
If you got another professor for this class, just take it. If not, Mike is not so bad if you have a nice grader.

I liked Tsiang, this review isn't about him.

It's about Jake Kramer the TA. Absolutely awful. IF YOU GET HIM TRANSFER SECTIONS. Just trust me on this one.

Michael Tsiang was an amazing professor. In my first quarter at UCLA, and in my first statistics class since junior year of high-school, he was able to help me understand the content easily and do well in the class. The tests are all multiple choice, and he has chapters of reading for all the content he covers which are very straight-forward and help you understand what you're learning. The homework assigned can be challenging, but it is always testing a topic that you can learn through the reading, which he also goes over in class. Most importantly, it's very obvious that this professor really cares about how well students do in this class.

The worst professor ever in college.
tons of meaningless homework, torturing exams and scores, and horrible TAs (especially Jake, I think the only thing he wants to do is to make everyone fail the class)
Never, ever take this class, or any class, with this professor.