Saint,
Yautja,
17 years ago
Ripley hasen't actually killed alot of aliens if you recall. In Alien, she put it out into space. In Aliens, she only got a few while she was running away with the little girl, if any actually died, though im not convinced she got any kills there either. The queen was taken care of, once again, through an airlock. In Alien 3 it took the team of convicts to get it into a lead plate, and you can't even count that last queen as a kill, all she did was hold it while she fell into molten lead.
Plus the only reason Dutch and Harrigan made it was because in a movie they want tha human to make it in the end. If you put in the real stats predators are supposed to have, they wouldn't be killed one on one in a fight by anyone who doesn't know them.