Boardwalk Empire is not fiction. It is based on true events and a timeline of events that are to be known as actual occurrences.
This is why I think it is a pretty slow moving story line. They seem to be following the timeline of events, you would think that they would "embellish" a little to keep up the pace, but then again - that might completely fuck it up.
So far I am into it, hoping for a big payoff.