Yes he's a bad lecturer. Not only he has a thick Chinese accent, his lecture and examples are straight from the book.
His exams are however really easy. I recommend his class.

He was definitely my least favorite professor of the 3 series. His accent sometimes made it hard to understand him in lecture. His lectures were essentially verbatim from the book, examples and all, and combined with the fact that the classroom had no AC and was unbearably warm, it was easy to just fall asleep.

He only had one midterm, which I didn't like, but it wasn't that difficult. The final, on the other hand, was definitely harder and the average was around 60%.

My friend went to his office hours a lot and said that he's very nice. He just isn't a very good professor. About half way through the quarter I stopped going to lecture and just took notes from the book and ended up with an A-.