Not as dull as dish water, but not tasty soup either
The literal translation of the title of this movie is: Natural Born coward.
This classification of this movie should be crime/comedy is more proper, though it remains a question whether it was the original intend of the film crew to make it a comedy or not.
The three crimes were loosely based on the truth crime that really happened, and the film crew put them together for the story. Originally, the real cops who solved these crimes would probably be offended by the protagonist in this movie, but the accidental comic effect would certainly mitigate such impression.
In short, this movie is better than Minjing Gu Shi made in the same year, but not too much better, so it is not as dull as dishwater, but not tasty soup either.