Yeah, but Beowulf walks with the intention of hitting you as soon as that fight begans. Vergil just kinda walks like he's taking a walk in the street, and he also doesn't walk towards you right away, he kinda walks to the side at first as if he's ignoring you. (Heh, I would notice such details >_>)
Geryon runs ready to attack, you have to dodge him right away. (Which is something I failed to do many times.)
Beowulf was easy for me on HOH mode. All you have to do is shoot him. I had a problem with Doppleganger though, cause in order to hit it you have to cut on the light, but it wouldn't allow me to, it kept hitting me, so I said f**k this and just bought some holy water for his/her ***.
PS: I said his/her because Doppleganger has no gender untill it takes a form. Dopplegangers are real paranormals ya know.