FBI Files profiles some interesting cases, often cases you may have seen in the news. It seems as though they get the full cooperation of the FBI, as many agents and investigators are interviewed - mostly in a story telling fashion. As the story unfolds we are blessed/cursed with re-enactments. That is one of two weak points of the show, in my opinion. The other is the fact that they often drag out the story to fill up the whole hour. Every time we come back from commercial the narrator sort of sums up everything we've seen so far. As you can imagine, by the end of the last commercial break, the lead in can be quite long.
Oh well, every show can't be perfect.