Supergirl's writing was a train wreck. So many baffling things I have to assume studio meddling. The movie otherwise was fine. Actress, fine. Direction, production, special effects, fine.

This is a distressingly common trend in big budget movies in the last ~10 years or so. Casting directors seem to be doing great; it's been decades since we saw someone straight-up poorly cast, like Clooney as Batman or Julian McMahon as Doctor Doom.

Special effects are a somewhat mixed bag, but that's more an issue of SFX houses not being given the time and opportunity to do the best work that they can. When they're given time and used properly, it's entirely appropriate to say that special effects and CGI are better than ever before.

But writing for some unfathomable reason seems to have taken a turn specifically for the worse. I've heard that writers are being given less time to adjust scripts during filming, and that certainly fits with a pattern I've observed where there seem to be a lot of movies where the script feels like a first or second but by no means a final draft, as if one more final tweak could have taken something from passable to excellent.

Wherever the exact cause, "I liked everything about this movie except for all the things that happened" is a real fucking bummer of an experience, because you can so easily see how the movie could have been great, but just... wasn't.