A great adaptation of a great graphic novel. Not slavish to the original text, but where it differs I think the changes are well-considered.
Like any good comic book story, there are moral dilemmas left and right, but unusually this story allows the darker choice to be fairly represented and even presented as the preferred option. The ends justify the means. Controversial and boldly stated. This is more interesting and intelligent fare than the usual showy superhero blockbusters.
It's aged very well too, considering the technical advances since it was made.