Wonder Woman also manages to make great humor out of how she's basically in the wrong place, wrong time. That contrast works and makes all the interactions and characters themselves around it more interesting than they would be in a different plot. The ending really is the greatest weakness of the movie; a clearly way easier and better ending would have been that there was no big bad guy, that it was just the humans being humans. Now it just fell flat instead of having some slightly deeper and way more interesting insight.

I'd say it's what usually fails most action films in general though. Big bad evil, hero fight evil, evil beaten yayy but heavy cost. Even otherwise good action films like John Wick end up repeating the cliché. It's very disappointing every time they do it and has ruined so many movies already. Do people really want to see the boring end fight that you know is coming and will always go the same way over and over again?