How to evaluate Ching-Ying Lam's acting skills?

I grew up watching zombie movies by Ching-Ying Lam and others. I don't think they are classic. I think as long as he is here, I will watch them. As for his acting skills, it must be quite good, because it is said that he learned those related gestures and movements from a real master when filming. That's why we look so real.