Wonder Woman does seem far more well-adjusted than Batman and Superman. Both the male superheroes in the current DC universe are portrayed as quite personally raw individuals. Not exactly damaged but having very deep and vulnerable emotional needs. Superman is exceptionally lonely and self-isolated. Not knowing himself, he wants to find a way to fit in with other people - to find a place to fit in, really, so he can actually become someone. In MAN OF STEEL, he's not so much a vague character as a desperately undefined one. The whole movie seemed about his struggle to find his character.
In Dawn of Justice, he's dealing with being misunderstood basically as soon as he discovered a place for himself. Bruce Wayne, on the other hand, is a desperately fearful character. He's driven to preserve his safety and projects his own fear to the city around him and then to the entire world in his need to stop Superman upon whom he projects all the threats he feels personally.
Wonder Woman doesn't seem to have any deep, solely personal needs or fears that she's driven to fulfill in the same way. She seems much more like a classic hero closer, but not exactly, to the mold of Donner's Superman. That's an appealing direction for a character, but Snyder's more emotionally desperate approach for the other iconic DC heroes - while not as appealing - certainly is valid.