Good movie but not the best

Rating: 6/10 (22 December 2019)

A bit slow start until the middle of story but towards the end, it become interesting. A bit confusing about Margot Robbie cast in this film, seem not related to the main story. Also i dont know the function of bruce lee character to this film. Dalton's wife also no big function to this movie. Film duration too long makes the film looks boring.
Is it based on the true story or what?