I found Baccano thanks to a Youtube top 10. I wasn't expecting to much from it, cause I had never heard about it, and that's how I get new series (By recommendation); but the serie really got me.
For a second, imagine an Anime directed and thought by Quentin Tarantino. From the story line, to the great characters creation, this anime is splendidly well done. It took me by surprise the similarity between its soundtrack and the cool bebop jazz from Cowboy Bebop. The bunch of characters allows you to get familiarized with at least one of them.
As something coming out, apparently, of the mind of somebody like Quentin, this Anime has it all: a great history, with inner histories that mix with others and gives you a good idea of the personality of all characters and their relationship; it has blood, a lot of that (something that you could not miss in a Tarantino movie); it has comedy, a good peace of it thanks to the main couple Isaac and Miria; it has a supernatural argument, based on alchemy, wich is one of my favorites branches in the supernatural; the design of the characters ambiented in the 90s is just wonderful, as well as its art; and for the last but not less important, it has a time line that is not continuous, wich makes the history very interesting and dynamic, with random flashes to the past and future, jumping in time, trying to put the pieces of the history together.
Even though that the serie is a little bit short (13 episodes without the ovas), it's a great anime, 100% recommended before die.