Professor Ni is one of the most disorganized professors I have had at UCLA. On our midterm, she forgot to include the right answers on the multiple choice and stopped us every 5 minutes to say that there was a typo on her free response. When students say they are confused, she openly doesn't explain it and just moves on and sees no issue. She is a nice person, but a terrible teacher. The TAs often didnt know anything about the class because it wasn't communicated to them and what we did in discussions were completely different than lectures because our TAs said they weren't told what was going on in lecture. Professor Ni is the kind of professor who still gives a midterm even when classes are cancelled due to fire warnings (this happened). She also doesn't post the lecture notes until ~2 days before the exam for you to study. This class is basically "how well can you teach yourself physics". Take another physics professor if you can.

Prof Ni is the sweetest person. Physics 17 is kind of a boring/shallow class on its own since it is sort of just an introductory dabble in quantum/stat mech, but she explained the concepts very clearly and the workload is light. The exams are long but not hard. I don't really care for the class itself as it is mostly just taking textbook formulas and applying them without derivation, but Prof Ni is like a mother to us, her kindness brings me joy in the dark times of COVID.

Ni is super nice and was one of the highlights of my quarter. The material taught wasn't anything super crazy or difficult but I feel that's to be expected with a class like 17. In any case, it was all taught rather clearly. The midterm and final aren't anything too hard but they are really long. I also found that it was pretty easy to lose points on them since about a third of the tests were always multiple choice. So, if you got a multiple choice question wrong you could lose a sizable number of points on the test.

I loved this class. Would take again.

She is the best. I felt as though she was very caring.

Her grading is pretty nice. I would have gotten a B+ with other professor, but I received an A+ with her.

Don't take her, enough said.

The review right below is very comprehensive. Sums up everything I had in mind.

tl;dr Avoid taking her, there are many many much better physics professors than Ni Ni

My first quarter experience at UCLA was totally haunted by Prof. Ni. She has a think accent but to her credit she tried really hard.

After midterm1, I decided to quit her lectures and study from the textbook instead, just like everybody else.

I'm still trying to figure out how she got the job.

If you can avoid taking her, do! Her lectures are poorly organized and she mostly just reads from the textbook. She also has a relatively strong accent and doesn't project very much, so it's hard to hear/understand her. Her midterms were okay, but she misspells a lot and the TA's had to clarify and actual changes parts of problems so they made sense.

Let's run over the grading scheme really quick:
Homework: Mastering Physics, 17%
Quiz (given in discussion section): 3%. So basically attendance.
Midterm: 40%
Final: 40%

Overall experience: horrific.
I feel really bad for Professor Ni as she really cares about her students and tries really hard to teach, but there is a big difference between having the skills and trying hard.
She is an Assistant Professor, to my surprise, as barely anyone show up to her lectures.
The book does a much better than she does.
She does not give out minuses, so 30% A (A and A+), 30% B (B and B+), 30% C (C and C+). Nice grading scheme as it looks like, but her tests are really hard with the average on the midterms are, in order, 31% and 41%. She drop the lower curved score, but that is still a really low average.
I will have no problem with hard tests only if she teaches well, which is not the case here.
Her lectures are sometimes disorganized and incomprehensible. Her notes are illegible. She tries really hard to become better, but it just does not work.
She also put up videos and expect us to watch those before class, and I am pretty sure rarely anyone did that. The conceptual questions in class are interesting, but are not necessary.
In addition, Mastering Physics takes little time, and there is a problem with that because we are not given enough practice for her hard tests.
Overall, avoid taking her if you can. I just feel like her brilliance is only suitable for lab works rather than teaching.