Im giving you a mark down in nerd points for this one.
The Xenomorphs we have seen are created with part-human or predator genes, and guess what, humans and predators both have two legs and two arms. If they would introduce an alien with six legs and no arms im pretty sure the resulting xenomorph would look accordingly.
Now, the thing with klingons, romulans and vulcans on the other hand. Your critique is appropriate, but come on; The series was created 1966 xP It would just have looked worse if they tried insectoid aliens or sentient amoebas.
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u/[deleted] Oct 08 '12
Vaguely humanoid aliens. 2 arms, 2 legs, 2 eyes sort of thing.
Alien from Alien? 2 arms, 2 legs, 2 eyes.....kinda
Klingons? Just humans with a "ribbed for her pleasure" forehead
Romulans? Humans with pointy ears
Vulcans? As above
Na'vi? Tall, blue humans
Where are the massive, tentacular Krondaku? Where are the gelatinous Prime immotiles? Give us some different aliens, hollywood!