The opening to Baccano!, an anime from 2007 I watched recently with friends. This is the adaptation from a light novel, and it looks really good. The style is consistent and it does as good a job it can at keeping the characters distinct (there are A LOT of characters), and it was a very good idea to repeat their names with their faces for the intro, as you will need help remembering them all at first.
I really like the animation in this series. If I had to pick out one issue, it would just be in the beginning of the intro where Miria points with her right hand at the bag. It looks really wonky without any other part of her body moving with it.