I didn't catch it in theatres (sadly) but had heard enough things from people who know what kinds of movies I liked, that I went ahead and grabbed it on bluray. I love it. I've never seen Ryan Gosling in a movie before that I am aware of, I heard a bunch of people poo-pooing the movie because it had a "Chick Flick" actor in the lead, I heard a bunch of people complaining about it being slow, and others who were grossed out by the violence.
I thought it was a great story, I liked all of the characters, I enjoyed the timing, the lack of pointless banter, the music and sounds were fantastic, and that when it was time for action it was deliberate and without nonsense. Pretty close to a perfect movie in my book. I'll watch it many times.