Now don't get me wrong, that wasn't that bad as far as pilots go. Pilots are thrown together to show off to the networks, and it is highly probable that things will greatly improve in the near future. I'm fully aware of the pilot process and I'm aware that the show could be significantly different than it was today, but that first episode was dripping with more cheese than a freshly dipped fondue fork, and was dissatisfying in more than one way.
I'm only a few lines in and we've barely scratched the surface, and yet I feel like my cheese comparison's reached it's melting point (that's a callback to fondue, which was literally just mentioned), I'm going to go with corny as well, making it a little less saturated. The plot of the first episode seems a bit too typical when broken down, what with the common tropes of the hero creating their villains, or in this case, Kara bringing Fort Rozz with her out of the Phantom Zone, linking the hero with the villains and giving her a personal sense of responsibility for them. Not to mention the villainous teaser at the end, which of course reveals part of the evil grand scheme (world domination, who would have guessed it) an the shocking reveal that the apparent Head Honcho of Galactic Evil Inc. is none other than a blood relative to the protagonist - and this reveal was so underwhelming that I'm actually going to just focus on it for a second -. The dramatic music and the fact that it was the last piece of dialogue in the episode makes it seem like Kara's blood relation to this woman is a momentous revelation, even though she calls Kara her niece like thirty seconds earlier, which makes no sense.
The corniness factor practically inflates exponentially when dialogue is looked at in addition to the plot. If it's not two sisters having a fight where it turns out one of them was jealous and keeping secrets and really just wants what's best for the other, like "Why, because she's a girl? That's what we were counting on" to Henshaw not trusting aliens and refusing to work with Supergirl until he had no other option, going from "You can't, you can't, you can't" to "Kick his ass champ" with basically no catalyst whatsoever, it's unrealistic. Why was Alex able to blackmail Henshaw to let Kara help? Why did her mind change so quickly? Why did she wait until Kara was actually fighting Vartox to reveal such crucial knowledge about Vartox's weapon and what Kara was going to do? Why is Superman not coming to help with the threat of all the inmates of Krypton's SuperMax sinister plot, and instead leaving them in the hands of Supergirl, a complete newbie, because he "has faith" in her? Is that really enough of an explanation when the fate of the world is at stake?
"Because that's what needs to happen for the show to happen" isn't a good enough answer. The show can have all these loopholes if it's willing to find ways to explain them. Even if a show is meant to be enjoyed by new viewers who aren't familiar with many of the concepts, there exists a level oversimplification that is just insulting. Between the plot and dialogue the entire episode was a big pile of cheesy corn.
I understand that pilots are just the beginning of a shows career and things could change drastically, and even though this was a rough start I expect to see much better things in the future.