I like this thread.
First, I agree with the uniqueness of the warforged concept. In fact, the uniqueness of the Eberron races was one of the things that hooked me in the first place. Changelings, kalashtar, and shifters are all much more than "humans in funny suits." They each have a completely different cultural mindset, built into the character races themselves.
Also, on the topic of representing alien psychologies:
From the writer/roleplayer's perspective:
Mallus said:
If we're writing them, what else could they be than something inside us?
You are entirely correct, I think. Because a human is creating the role, the role can be nothing more than something intrinsically human, anthropomorphic, if you will.
From the readers perspective: No one wants to read about something truly alien. When we read, we want to associate ourselves with the characters, see and understand how characters develop. If the character was utterly alien, without any human connections, the reader would be unable to identify with the character.
So not only
must the creator come up with something with some human characteristics, the humanness of a character is
necessary for the reader to enjoy it.