My impression after watching it is that it was extremely good in most ways, with some bits that WERE clunkers, but all of them were fixable (none of them were in the essential setup or talent, but instead were stuff like cliched dialogue, which can be fixed, and bad acting from someone who was only a guest star, so he won't be seen again). Of the regular ongoing actors, only the guy who played the DEO boss had any real acting issues, and he just needs to tone it down. Melissa Benoist herself did a bang up job, and even Chyler Leigh, who hasn't always been a totally solid actor in the past, did pretty good here. Callista Flockart was VERY over the top, but in this specific case it worked for the character.
The overall plot was decent, the conceits they needed to bow to in order to keep Superman mostly out of it reasonable (because they didn't duck around TALKING about him, thank god, and even called him by name), and the FX pretty good, other than the actual plane (but the flying PERSON was really well done, which was FAR more important than the plane).