Bringing a female superhero to the big screen in a leading role hasn't been done often, but DC did a solid job of it with Wonder Woman.
Batman v Superman: Dawn of Justice, and the entire movie is basically a flashback sequence from that modern-day version of Diana. The entire movie takes place in the past, specifically the World War I era. If that sounds familiar, it's because Marvel did more or less the same thing with Captain America. It's hard to really fault the writers for copying, though, since all these superhero movies have their roots in decades of comic book stories, many of which are very similar. Hard to really say who is copying what, with all that history.
I felt like the movie did a good job of setting up Diana's past, explaining the role of the Olympian gods and her home of Themyscira. Seemed to me that there was enough explanation to make sense to a non-comic-nerd, though I admit that it's hard to tell since I am one. There have been lots of versions of Wonder Woman over the years, and this one seems as good to me as any.
Gal Gadot did a fantastic job as Diana, and I thought the writers and director captured the character very well. Diana's naivete is very clear as she makes her first foray into man's world, but she never seems weak or lost because of it. There's very little sexual content, which isn't easy when your main character is a gorgeous woman running around in skimpy battle costume. There's a fine line to walk with this character, and I think they did an outstanding job.
I wish I could say the same about the action scenes. There's constant use of slow-motion sequences in the middle of the action, and just about every one of them annoyed me. The scenes themselves were fine, well designed and executed. I particularly liked the no-man's-land advance, with Diana playing the "tank" for the soldiers. I just wish the director hadn't been so in love with slowing the action down over and over again. It's fine to do that once or twice, to call attention to some particularly impressive feat or important small detail, but it was badly over-used here.
The plot and minor characters are serviceable, if not particularly impressive. The "twist" with Ares' identity and the god-slayer weapon was so heavily telegraphed that I hesitate to even use the term. Outside of Steve Trevor, other characters are present only as opportunity to show off some aspect of Diana. But none of that is surprising, as it's hard to do much in an origin story film outside of the main character without making things too complex to easily follow.
Wonder Woman is a big step forward for the DC cinematic universe. I know we'll be seeing more of Diana, and I look forward to it. I hope to see more of this quality of writing, directing, and production in the future DCU movies as well.