I read pretty much anything, from fantasy (City of Stairs by Robert Jackson Bennett) to romance (Bared to You by Sylvia Day) to classics (Heart of Darkness by Joseph Conrad). The only genres I don't read are self-help and comic books/graphic novels.
Parts of it were horrible to read, but I loved it. The rape scene and the torture scene were difficult to read, especially as my memory works way better than my imagination. I saw the American version of the movie first and so, was able to remember the very graphic way it was filmed as I was reading, instead of relying on my own imagination, which is not nearly as sadistically creative as the director of the movie. But all this made it a really gripping book to read. Larsson was a great crime/horror author, imagine what he could have written if he was still with us today.