Even in Farscape the aliens were basically upright-walkers with eyes, nose, mouth and similar ways of thinking to humans.
Ender's Game, if it's anywhere near true to the novels, has realistic aliens.
Greg Cox wrote:
In large part it depends on the story you're trying to tell. If you're trying to tell, say, a morality play about racism or euthanasia or overpopulation, what's the point of making the aliens eight-armed crystalline monotremes or whatever? That's not the point of the story. If anything, making the aliens too exotic would just be distracting.
I disagree. If the message of a show is that we can learn to tolerate and accept people's differences it undermines that point for all aliens to act exactly like us. You're not really accepting people's differences, you're saying that we can only really accept people who think and behave exactly like us.
But Star Trek needs human-like aliens for two production reasons. Aliens must be: 1) Cheap, 2) F***able.