Guilty pleasure. Saw it months ago with no foreknowledge of the comic, and I was blown away. Good teenager-coming-of-age movie, most excellent soundtrack (one of the best I've heard in years) and a break-out performance by the young lady (Chloe Moretz) who plays Hit Girl. 
Moretz is Anna Paquin good at that young age, and will be seen next in a vampire movie close to my heart.--the original, that is.
Aaron Johnson (Kick Ass) also went on next to play a young John Lennon in a movie yet to be released. I think that will be an interesting perf too.
A truly mesmerizing movie that warrants repeat viewings.