Why do we like Vince & Beatrix?

I think that these characters were more three-dimisional than a lot of other characters in QTs films. We got to see more sides of them more sympathetic sides. We got to see that Vince was kind off goofy and incompetent. We got to see the Bride portrayed as a young girl getting left behind by her lover/mentor to be trained in kung fu or whatever. That’s what makes us like them more. We got to see them as people as human beings not just killers.