Deep Throat drama 'Mark Felt: The Man Who Brought Down the White House' stays mostly on the surface

It’s hard to pinpoint the moment the audience might be tempted to give up on “Mark Felt: The Man Who Brought Down the White House,” a sleek, scattershot portrait of the FBI associate director who spent more than 30 years hiding behind the naughty nom de guerre of Deep Throat. For some it might...