i think people are forgetting...
based on some comments, as well as certain movies, i think people are forgetting that xenomorphs are actually quite killable. they are just bugs after all.
the only movie that has shown this properally was ALIENS, via showing alot of xenomorph death due to armed marines, sentry guns, and even the terraformers. Alien and Alien 3 make sense that only a couple can do alot damage cause well in alien it was a bunch of mineral farmers, and in alien 3 an unarmed prison. and of course there is the failure in my eyes alien ressurection, in which a ENTIRE military station bails because a little group of stray drones got loose.
the thing is, while xenomorphs are deadly, they are not unstopable. they are more of a virus or epidemic, namely cause ou can keep killing more of them, but they will keep comming back as long as there are hosts availble. xenomorphs only really have numbers on their side. so just remember they arnt godly unstopable beings (which some like to bielve).
~edit ( i did not intend for this to be a biased topic erego heres my post from the second page)
i love the the whole idea of the xenomorph in general, and what i say should go across the board, dont overrate preds, humans for xenomorphs, namely cause they can all die in the blink of a eye. none of the creatures are immortal and they all make mistakes. there are strengths and weaknesses for all. with predators yeah you got technology, but that also comes with the arrogance that comes with it, ala the preds death in PREDATOR and PREDATOR 2, humans have will and thought, but that also comes with the fear of the unknown (people who panic tend to die), and then you have the xenomorph, the pinnacle of evolution of natures raw fury, but it is still just a beast (except for maybe the queen), even synths have laws that govern them, that they have to abide by. im saying dont over rate anything, it could go anyway, i mean look at the glory rpgs we have had on this forum, the kickass'ery is all across the board