Baccano! is perhaps the first anime series that I've seen that takes the period of the 1930s and dives into the hearts of several gangsters, all with very distinct personalities - something that makes this stand uniquely from its peers. A pair of effective con-artists, a man with a lust for blood, a young man welcomed for the first time into a mafia family, a man with a secret, elongated past, a woman who fights alongside her "supposed" father, and even a young boy who faces torments worse than death itself. Put it all together, and you only have a part of the story that Baccano showcases.
Baccano's execution may throw some off a bit to start - handing 17 characters already suggests this series is devilishly ambitious, but yet it presents a rather looping story revolving around these characters that seem to "crash" into each other, whether knowingly or just by situtational connections. The storyline jumps back and forth between the years of 1930-1932 primarily, though there are treks to both the past and present in brief context. There's definite story here: it's mainly driven by the characters, and it's also driven by thematics that drive this beyond a traditional gangster story.
I enjoyed this, and would recommend it everyone to watch this anime. I definitely hope there's a second season to this, if the award-winning manga is any indication.