My thoughts on this are basically the same as they were the first time I saw itIt was...ok. A bit bland, a bit annoying but with some good stuff, and Supergirl herself is pretty good (as is Jimmy Olsen). Her guy friend from work was inoffensive, although kind of forgettable. The action was also pretty good, especially on a TV budget. I hope we get more of the character who imdb calls "The Commander" (he's the one who was giving orders to the villain of the week over video in the truck. I liked the actor in his (somewhat minor) role in Warehouse 13, and it would be cool to see him again.
As for the bad stuff, I hated the generic "you shouldn't be a hero" stepsister. She was giving me a big "Johnathon Kent in Man of Steel" vibe after the plane incident, which is not a good thing. The fact that she also betrayed Kara (which is also kind of a betrayal of Superman, who gave Kara to the Danvers family probably trying to avoid something like what the stepsister did with the government) was also pretty bad.
You understand though that she told her so that Kara wouldn't get caught by the very agency she works for?