"Wasn't that Alien she shot in the head? The round ripped through the head and shredded through the inner jaw. Even you could've ripped it out."
We don't know that. The round probably missed, and even if it didn't miss, I'm still pretty sure that no man/woman on Earth would be able rip it out without the help of power tools.
"It wasn't that thick. You could've done that if an Alien was trying to get you too."
No I wouldn't. She was locked up in a prison cell. They don't construct prison cells and juggernaut starships out of tinfoil, do they?
"I have. Her punches wouldn't stop a Predator. The Queen sent Scar flying and he still was able to leap several feet in the air to poke her in the 'eye'."
Well, that was not a focused punch, just like the Predator in the first Predator movie didn't use all it's strength when playing with Dutch in the mud. The Queen in AVP just slapped Scar with back of her 'hand'.
Oh, and not to forget! Christie slammed a frigging powerlifting bar in #8's head, which didn't seem to have any effect on her at all (she barely flinched when it hit her)... just a little nosebleed.
"Sure sounds like it in this quote:"
What I meant in the quote you referred to doesn't say that at all. Arnie/Dutch was just a human, Ripley 8 is half Alien.
"And I'm saying she wouldn't be able to last 10 seconds in a hand-to-hand fight. She's sorely outclassed."
I'd say that she would be able kick his ass without a problem. Predators are smug arrogant bitches that think too much of themselves. The Predator who would fight Ripley 8 would most likely assume that she's just a regular human, and he would start fighting here thereafter... which gives her the upper hand, at least in the beginning of the fight. He'll try to slap her and she'll block his strike and bash his face in, which will blind him, giving her the advantage during the rest of the fight... yeah - Ripley 8 is not sorely outclassed here.