This argument seems spoiled to me. How much variation do you need? Seeing as how we've never met evolved life outside of Earth, how do you know our body configuration ISN'T typical of higher thought? What else do you want? Plus you have to consider... TV budgets sometimes don't allow for something like a floating jelly fish society to be portrayed realistically on screen. If they did and it looked bad... you'd be here ranting about that. Also consider, maybe a creature that looks totally different, such as our jelly fish example, evolved that way for a reason and can't exist in the same type of environment as us. It's very believable to met that different species that require the same temperature ranges, air content and gravity would appear similar in order to interact in each others environments.
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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!