Hayden Zaller is okay but not always strong

Hayden Zaller as Zack in American Underdog (2021) made me pay attention more than I expected. There are good moments, especially when the scene is quiet. The performance is okay for the movie, but sometimes it feels a little flat. I wanted more detail, but it still has some useful emotion. Some parts are good, but other parts feel normal and not very fresh. I can understand what the actor wants to do, but not every scene is strong. Maybe other people will like it more, but this is my feeling.