The loss of Bruce Wayne left a void in Gotham. Nightwing and Robin replaced Bruce by patrolling Gotham. Meanwhile, Batwoman tries to investigate Bruce Wayne's disappearance.
Showing and introducing members of the Bat-Family gives a special impression for this film. By bringing the story of Batman's disappearance, the existence of Batwoman, Nightwing and Batwing to replace Batman's position is actually enough to provide a good story. However, all of them do not have a strong motive so that the stories that are brought at a glance seem ordinary and overlap between them. Making Talia al Ghul a villain does not create an evil atmosphere. Likewise with Talia's group of villains who appear too much but don't add anything to the story. The threat as a villain also doesn't make the story in this film develop. That way, the ending of the film is also not interesting.
The appearance of Bat-Family members is indeed something interesting in the DC universe. However, too many characters enter into too many conflicts that are created without strong motives from each character. The main portion of this film falls on the characters Batwoman and Nightwing. Seeing the Batwing perform actually doesn't make much of a difference either. Not with Robin who does have a bond with Talia.