Underwhelming ending to a good movie

Rating: 6/10 (15 November 2017)

Captain Sullenberger and First Officer Stiles landed a plane on the river Hudson. It sounds quite miraculous and the premise of the film gripped me instantly.
Director Clint Eastwood tricked me into thinking that this will be just some generic airplane disaster movie. The opening scene, where Sullenberger crashes the plane, turns out to be a nightmare, which is utilized fairly well in the movie. The landing on the river haunts the captain and Tom Hanks does excellent work in portraying the calm man who is tormented by fear and suspicion.
Sully's wife and daughters are at home waiting for the crash investigation to be over and worried of him. Laura Linney portrays the wife and she was great. I loved her in the movie. I saw her performance in the movie Mr. Holmes and she portrayed fairly similar character in that movie as a worrying caretaker for aging Sherlock Holmes. She was very good and sympathetic in both movies.
I love the premise of the movie. Sully's nightmares were really interesting, I loved the way Eastwood portrayed the human side of the accident.
My first complaint is the supposed "main antagonist" of the movie. Mike O'Malley portrays Charles Porter, the man leading the investigation about the investigation. He performs well, but it is very unnecessary for his character to be so obnoxious in the movie. I sided both factually and emotionally with Sully in the very beginning of the movie, there was no need to put an antagonist in the film to make the viewer more emotionally invested in Sully. His character could've been there without him being a total jerk. Did the writers think that the viewer would not side with Sully in the movie? Are the geese that crashed with the plane the misunderstood heroes here?
The screen time where characters are pitted against each other could've been dedicated to portray the nightmares of Sully even more deeply. Oh well.
The highlight of the movie was the mid point where they show the plane get damaged, being piloted into the river and the passengers and the crew being rescued from the river.
I was awestruck with it. I got fully caught with the scene and the scene made me cry. Everything with it hit me so hard, I definitely wasn't prepared for the scene to completely suspend my disbelief in it. The small character arcs of the passengers, the crew working during the emergency, the personnel in the flight control, the rescue crew, everything. I haven't been crying like this because of a movie since The Wrestler, and it was bad.
There I was ready to give this movie, despite minor flaws, a 9/10 immediately.
But after that the movie falls flat.
After the mid point, everything in the movie feels just off. The investigation committee trying to make Sully guilty turns, of course, to be wrong in the movie. Sully is officially made a hero. Sully's nightmares end after he goes into a bar for a drink and there he figures out how to convince the committee that he did what he had to.
The ending is so dissatisfying. The character buildup towards the end just feels so bland and obvious. Everything in the end just screams "obviously this was going to end like this, what did you think". I didn't want a surprise ending, but rather a satisfying ending.
Maybe I should've sided with the geese.
I rate this movie six Aaron Eckhardt's mustaches out of ten.