I remembered reading it was Eastwood only because when I first heard of the project it seemed like an Oliver Stone kind of flick. The little I know of Hoover makes it seem like he was a very complicated dude, as the NR article suggests. It's unfortunate that such liberties would be taken with the script.
Also, I don't think most of the people who will watch this know what Hoover looked like. To go so far with the transformation of DiCaprio is distracting, at least to me. They could have settled for an approximation. It's not some comedy show where we are looking for impersonations.