Just not a good teacher. He barely explains anything during lecture, jumping into advanced concepts out of nowhere while writing from a paper he prepared beforehand, and his homeworks have nothing to do with lecture 90% of the time. You'd be better off skipping lecture and self studying.

i have to say that sung is not a good profession when teaching, but he is not a bad grader. He gives curves to ensure most people gets an A or B+, and almost all of the questions on exams were given in practice exams. If you do all the homework and take the exams seriously, A won't be hard.

don't do it

Literally just a textbook, honestly got confused by some of his own questions. Tests were fair and were similar to practice exams. Clearly loved doing physics in math.