Every time I watch this I think how Joe Wright's expertise in theatrical puppetry almost makes him too perfectly qualified to adapt this story in the way that he did. Something about it just makes sense; that Tolstoy's Karenina is a waltz - a sophisticated performance in which everyone gets their dance with the ones they love. "There are as many kinds of love as there are hearts." And if there's any subject that deserves theatrics it's the subject of…
Applause mainly for the stunt work and choreography, making up for its "lack" of narrative by way of being within the martial arts / yakuza / assassin genre.
On another note, Mary Elizabeth Winstead could probably play a cactus and still be the greatest at it.