Haha. It really is useless. I kinda had Star Paladin Cross as a companion for a while. I don't recommend eating someone in front of her and expecting her to stay.

And it IS fun to chop people up and eat them. That one hooker you lead to Rivet City. Well I took her there. And when she got to the bridge and started walking off I used the ripper to chop her up then I ate her. Mmmm tasty.