I laughed all the way through HC2. Its sheer depravity and the lengths to which it went were so far over the top that I couldn't construe it as anything but a comedy.
I've seen a lot of equally sick movies (the sub-genre of German splatter picks can't even be described).
Having said that, HC2 is certainly no better than those films. It's pretty extreme. But I found it had a distinct sense of humor similar to the new breed of Japanese "grindhouse" films such as Robo Geisha and Tokyo Gore Police.
You want disturbing? Check out Irreversible by Gaspar Noe. It's not classified as a horror movie but I've yet to see anything as deeply upsetting as the infamous subway scene.
....but the world goes 'round