I think the ending would have been better if they hadn't killed off Ludendorf at the beginning of the sequence. I actually was a fan of the initial introduction of Ares - I liked the idea of him acting as just a catalyst for humanity's darker impulses, and I liked David Thewlis' calm, quiet reveal (though I still don't really understand his whole "I'm gonna help arrange an armistace so the humans can undermine it" plan). But then they just went ahead and turned him into a generic armored hulk who looked indistinguishable from several other DC and Marvel villains. I think if they'd left Ludendorf alive, and had him lead an assault of heavy weaponry against Diana while Ares just stands off to the side, calmly building up the mayhem, it would have gelled more with the concept of war that had been running throughout the film.