Based on Episode 1 of Season 1, Boardwalk Empire, although flawed, is enjoyable to watch. On the downside, it's not easy to follow what's going on or who is who or who or what is on which side of what, and it annoyingly imitates signatures of The Godfather (e.g., carrying out murders with opera playing in the background). At the same time, it's got Steve Buscemi in the lead and Kelly MacDonald, and even Omar from The Wire, and screen characters don't get any better than that. In short, the characters portray real people, the sub-plots are gripping, and the photography is wonderful. Can't tell if we'll ever get to Season 5, but we'll definitely get to Episode 2 of Season 1.
IMDb Link to Boardwalk Empire