Oh no, something on Hard might actually get the chance to inflict considerable damage if you let it stroll up and whack away at you several times and you're not wearing armor!
If you're so concerned about Gorefasts hurting you, then shoot them and kill them before they can. It's already more than easy to decapitate an entire gaggle of Gorefasts with a single 9mm pistol. However, if you believe there to be more than you can handle alone, then get your team to help. There's a whole "co-op" aspect of the game that tends to have a marked influence on a group's success or lack thereof.
If you do get killed by a Gorefast, then you should simply accept it. They're low level enemies possessing a multitude of weakpoints that just happen to pack a decent punch up close (And no, despite your exaggeration, they can't kill a healthy player without armor in only two hits on Hard). You can't just start crying for a change anytime you get killed by anything, particularly while in a difficulty mode meant to be difficult.