Let us end this Ripley business once and for all.
Ripley is Human for most of the Alien Series, save for Alien 4 when she's technically a Human-Xenomorph hybrid.
Whilst 'Human', she achieved the following;
Defeated a 'Warrior' alien (though not fast enough to stop it eating the entire crew). Had help from a decompressing airlock.
Defeated a couple of 'Warriors' via Pulse Rifle and Flamer, along with the odd Face-Hugger. Not in itself a god-like feat, given half the cast of the film achieved similar or better (Hicks got a Shotgun kill!).
Defeated a Queen with a Power Loader. Again, had to use the airlock.
Blew up a Dog Alien with molten lead and sprinklers. Had a bunch of rapists to help her.
Let's be honest here; Ripley's exploits don't come ANYWHERE close to what some Marines get up to. A 40K Terminator goes into a Space Hulk filled with Genestealers (Xenomorph equivalents) with only four of his friends as support, and stomps them all. Then he goes and finds the next Space Hulk, and does it again.
Hell, DOOMGuy has chalked up one bastard huge body-count that makes Ripley look like a drunken TA volunteer! He's fought his way across Phobos, Deimos, Earth, Mars and Hell (at least twice). He's killed untold thousands of Hell's minions, he's killed Satan (the Icon of Sin), and he did it ALL ALONE! That's just in the first two games. Let's be fair; Ripley is awesome, but he's horribly outclassed.