How was it rushed?
I really think Gaf likes using buzzwords they don't understand. The film literally starts with Hippolyta telling us that Ares is the villain. Diana's quest is to kill Ares and stop war, a childish attitude her mother knows is foolish. Diana goes on her quest and faces Ares, learning that Ares wants to use war to create paradise... by removing Wars instigators.
Diana kills Ares not to stop war, but to allow humanity to decide their own fate, good or bad. Because she's seen men like Steve and Charlie, who should be enemies, be genuinely heroic and fight battles that aren't their own.
And as it's a superhero film, CGI ensues.
It's not rushed, at all. I mean even if you think
Ares comes out of nowhere, they spend five minutes setting their conflict up for people in the cheap seats,
I can understand the feeling that the start of the film is rushed. We are told stories in flashbacks within flashbacks. Also I'm not sure how reliable her mother is in narrating those stories about gods, since she lied about part of it to Diana and don't have a full understanding. We also only see Sir Patrick a few times before his turn into Ares. I really wish these films don't force in a final boss fight when there is no need to, that goes for Logan as well.