Two words... Epsilon-Delta. He put an Epsilon-Delta proof on both the first Midterm and the Final, so definitely attend TA office hours or find another way to learn it. It didn't click for me and thought everything else was fine but it came back to bite me.

Overall meh lecturer and meh professor, those E-D proofs were rough though. Just your regular, run-of-the-mill, average UCLA Math professor.

This review is for MATH 32A. Mou is not an interesting professor. He does not use slides are animations, preferring instead to draw out diagrams and writing on the board. This means class goes slowly, but at least if you zone out, you can just check the board for anything you missed. His tests are disproportionately dependant on proofs, and I can almost guarantee his delta-epsilon proofs will get you a poor grade on the test. However, he tries to be helpful and spends the week before the final just covering topics that students have trouble with. Overall an OK professor.

Edit (6/7/2018): MATH 32A has been added as a course taught by Professor Mou. I have edited this review to be on the correct course (formerly was on MATH 170).