Well yes there is...,kind of.
While Diana is ultimately going to stop Ares and make its point about humanity not being what Diana thought it was, the fighting is ultimately over because the villain's plans are foiled. The war is done but Ares is not and Ares is apart of the war situation with him manipulating things.
What I'm saying is while the movie has it's message, it also unintentionally can be perceived as Diana defeating Ares which stops the fighting. She foils the villain's plans and everybody just gives up (as expected but still coincidentally timed). Sure we just got the message that regardless humanity is going to just do as humanity does, but the manipulator, the devil in the villains ear is defeated as the movie is wrapping up and everybody celebrates victory. It unintentionally gives the broad explanation that Diana was right which is why the ending has rubbed some the wrong way.
The movie does this which is why it gets brought up as much as it does since it unintentionally has two ways of perceiving the ending.