I watched the whole thing, and it wasn't awful by any means. You just have to understand that this movie is "based on real characters, but the events bear no relationship to what actually happened...and forget about the anachronisms." I'm not even going to try to list the goofs and errors in the movie. Just kick back and have a good time.
The production values are not too bad, though I doubt that the USA in the 1930s was as clean as it looks here. FDR, Cermak, and some others are a real hoot. I also suspect that Ness was a lot closer to the way he's played here than in other movies and TV shows.
The biggest objection I had was to Ray Sharkey playing Capone. Sorry, but it was a mistake. Sharkey does have a menacing quality about him, but you'd never have known that he was playing Capone unless the dialogue told you. (OK...maybe the scar.) They didn't put any effort at all into making him resemble the paunchy and balding gangster.
Finally, this movie is shot like a TV movie, but it IS worthy of the R rating. It's not really gratuitous, but it stands out.
