When I first heard Matt Damon would be playing Shelby, I though "Great choice". I think I may be the only one who did. Nonetheless, I still think it's a god fit.
As for the movie itself, I have not seen it. I'm not in a hurry to do so either. Hollywood has frustrated and irritated me over the years with their poor efforts on car based movies. Everything is dumbed down, embellished, and glorified, seemingly in an effort to make the story watchable. This is a shame because the stories can stand on their own without hollywoodification. It has come to the point where the more personal interest I have in a story, the less likely I am to watch a Hollywood movie of it. It will only irritate me.
Like most of us on this forum, I seriously dig this era of motorsport, and especially the Ford/Ferrari saga. General curiosity will compel me to watch it someday, but it won't happen for years.