I feel Michael Bronner is not convincing

Michael Bronner as Associate Producer in United 93 (2006) made me pay attention more than I expected. For me, it does not feel very real in many scenes. I do not hate it, but it did not pull me into the story. Some emotions are too simple, and I cannot believe the character enough. Many moments pass very fast, and I do not remember much after them. The role needs more detail, but the performance stays on the surface. Maybe other people will like it more, but this is my feeling.