Argento makes great films about serial killers, some people find them too pretty and not stark enough, but I think they're the best stuff in the genre, personally. I really didn't like the Dahmer movie. it seems to bring serial killing down to being bored, gay and having an asshole father. The Dahmer and Bundy movies have this draining "Eleanor Rigby" vibe. And there has NEVER been a good accurate movie made about Whitechapel. Anybody who wants to see what an embarassment From Hell actually was (no disrespect to Alan Moore) should check out
www.casebook.org. Argento's movies are about the happiest medium you can reach between the histrionic serial killings of slasher films and the actions of real serial killers.