There's common ground between the characters for sure (I've already said as much more than once) but I think it's very disingenuous to assert that the one was patterned off the other.
Its a fact, and I'm far from the only one to point out how much of WW borrowed from
Captain America: The First Avenger, or how the character's beliefs and motives are nearly the same--
CA: A young, inexperienced person seeks to enter a war as a way of stopping it, with others doubting his potential to be effective. Steve Rogers is presented as a young man with--almost--a physical revulsion of man's abuse of other men.
WW: A young, inexperienced person seeks to enter a war as a way of stopping it with others doubting her potential to be effective. Diana is presented as a young woman with--almost--a physical revulsion of man's abuse of other men.
CA: Dr.Erskine--who saw Steve's true, inner good, and believed that he had the right potential to become the Super Soldier (and all that the position means for the world)--is killed by a Hydra agent. His death (and faith in Steve) adds to Steve's already morally solid resolve to do whatever he can to work toward ending the global conflict.
WW: Antiope--who saw Diana's true potential is killed by a German soldier. Her death (and faith in Diana) adds to Diana's already morally solid resolve to do whatever she can to work toward ending the global conflict.
Those are the
essential, borrowed character traits--that which shapes them in the film, and now that we have seen Diana in
Batman v. Superman: Dawn of Justice, where she's even more world weary / no-nonsense, if not a bit jaded, that parallels Steve Rogers throughout
Captain America: The Winter Soldier, where his initial world view was altered (by force of circumstance / experience). There's no shame in recognizing the seemingly deliberate borrowing from
The First Avenger for
Wonder Woman.
Great, except Diana is *literally* a god. No "kind of" about it and it doesn't stop her being in the trenches with the normal people (again...literally!)
But she's not
seen as a god or near god by the humans around her, and (so far) she's not displayed powers that are beyond the comprehension of man, or classified as otherworldy. That's the key difference of perception between the two
The difference here is that Snyder's version of Superman seems to define himself by his power, which is not something that's really meant to be key to his character.
He's not defining himself by the power by power alone, but how it makes him different than his adopted family/species and the human values he sees as his own. He cannot possibly ignore that anymore than one can ignore any ability (natural or acquired) that separates them from others.
You seem to mistake "realistic behaviour" with "cynical behaviour". The latter is more common in the real world, to be sure, but these characters aren't meant to be reflections of what we are, but ideals to aspire to.
Superhero fiction is not cookie-cutter; there was never a blanket creative directive saying every character presented an image of where the audience would like to be--evident in characters as diverse as the Hulk, the Spectre, Batman, the Punisher, et al. There's noting cynical about that, if one does not expect all comic-based characters to be grinning their way though life and its problems.
The setting is bleak, but the tone certainly isn't. Diana is a beacon of hope and compassion amongst the death and despair. That's kind of the whole point of the character.
Her "hope" status was steadily shattered by the war, Ares and in the most potent moment, Trevor waking her up to the fact that the idea of evil where men are concerned are in no way conveniently placed on sides and categories like toy soldiers. That the lesson comes toward the end of the film sets Diana up to understand that nothing is black and white where evil is concerned. Although she maintains a moral center, the "we can all walk together in peace" kind of attitude she had early in the film is not to be found in the finale, and its certainly not seen in her future in
Dawn of Justice.