I see nothing wrong with his acting as he thought he lost an airliner. With that said, you don't like movie which is fine as I'm sure I don't like certain movies that you have an affinity towards, but, you don't have to justify your film opinion to us. We accept your opinion, but, many of us don't agree with it. To each his own!
The air traffic control guy that handled the plane in Sully and later we see him in a room alone at the end where he is told everything is ok, that guy had a terrible acting. He almost looked like a non actor.