Of course! They are the perfect killing machines. Unfeeling, remorseless. Their very blood damages everything. They are the biological equivalent of the self-replicating AI machines that similar sci-fi have ravaging the universe. They are the borg, they are the Tyranids.
That is why they make such great villains, in small scale encounter movies. It is a win just to escape with your life and burn everything behind you to ash.
Tyranids maybe. not self replicating machine though. Thats the Thing.
the Alien Xenomorphs have several major flaws. one, they reproduce via a queen. two, they require 2 stages of infancy. which is nuts. First an egg, then the egg hatches into a larva.. which lays eggs in hosts. wtf? thats an insanely shitty means of reproduction.
it would make WAY more sense if the facehuggers latched on to hosts, implanted themselves inside, and the "facehugger" body was then dropped, like a cocoon/vestigial body part.
the double egg as it stands, is a prime target for predication, or biological warfare on them. defenseless in egg stage twice. Also, lots of hormone processes that can be interrupted, with all this state changing via biological warfare.
the hive system has limited range. drones don't operate past a distance well.
they ARE almost perfectly deadly in space. the acid blood, tunnels, small spaces. they would not be that big of a threat when napalm and flamethrowers are involved. hell even in aliens we saw how regular guns tore them apart. the queen/hive system means they could be corralled pretty easy. even with wild animals getting egged with new queens. theres a limited distance an infected deer could travel.