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I'm actually quite fond of both Kingdom Come and the Kingdom Come cast. I like it because it completely humanized the DC hero pantheon: Even heroes have to get tired of constantly battling an unending stream of hatred; Even heroes get hurt and have to retire; Even heroes grow old; Even heroes fail.
So here is Wonder Woman. Wonder Woman is not so "wonderful" anymore. She's living with the frustration of having been stripped of her "Princess" title by the Amazons for failing to bring peace to mankind. So she turns to what she knows best: being a warrior.
Unfortunately Wonder Woman was never the leader that the inspirational Superman was - who is now retired and in hiding - nor is she the intimidating leader Batman is - who is now injured, has turned Gotham into a Big Brother playground and is hiding in the ruins of his cave.
So her frustration over the state of the world continues to build.