My spoiler-free Supergirl review
I personally loved the movie
Now keep in mind I'm not a comic reader (yet. i'm getting to it) so that is probably affecting my perception here.
Definitely could have most of the main character backstories expanded on (especially the main antagonist), but I personally think Kara's was fine and dispersed well enough throughout the movie, which is what I was wanting anyways.
Fight scenes look incredible. Please watch this movie in IMAX if you can, it is so worth it. Maybe it's recency bias, but I'd put the fight sequences on the same level as Superman. Also, we love strong women kicking ass while not overly relying on the same stereotypes that I think make so many other characters under the "strong women" umbrella fall flat in the end. Yippee for progress there!
And Milly Alcock as Kara? Easily the best part of this movie. I feel like she perfectly encapsulated her character in every facet, and all the people I watched with agreed that she was the best part. And I really liked her complexity.
Also liked the very small Superman cameos sprinkled throughout, feel like they added a touch of comic relief in a way that didn't throw off the movie's overall tone.
Anyways, I'll save my spoiler review of the movie as a draft and share it maybe three weeks to a month from now just so that most people who wanna see it will have seen it by then. But overall, very enjoyable movie and I personally loved it.