Because she choose to tell the story of Wonder Woman. Her character. Her journey. And villains were there as a challenge for her as every hero needs that. A conscious choice to put the spotlight on Wonder Woman at the expense of the villains. The villains weren't bad performances. Just not well developed to be memorable.
Acting isn't simply about performances. But it shall be able to bring the desired reaction in the audience. That part usually lies in the invisible hands of the director who is the puppet master of the show. The storyteller.
Now i am risking myself in coming across as a know-it-all. That can be annoying. That's not my intention. I am trying to show how Patty Jenkins is getting enhanced performances by posting two videos which on the surface is totally unrelated to the subject. But it actually is. First one is about 'Why Marlon Brando is considered the greatest actor ever?' These two videos are more academic in nature but i find them fascinating and relevant to the topic if anyone wants to dig deeper. Or else one may simply click the last link in the next post and be done with it.
That part about getting the reaction in the audience from an acting performance lies at the hands of the director who is the one telling the story.