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.