Probably a Good Long-Term Move
Berlanti is doing this because the cards are stacked against this show from the opening credits. This is a show about Superman’s female cousin. Like it or not, that flies in the face of the target demographic.
So the producers look as if they have decided to not take any chances. They are opening the gates, pouring it on, and going for broke. That’s the only plausible reason to bring out this major league bad guy so early in the game.

The costume also tells us that the previews are accurate, and that this is going to be a more lighthearted show as opposed to a gritty crime drama. That’s probably a good idea, as Supergirl fits better into a Flash-type category much better than a category that includes Arrow: Season 1 or the Netflix series Daredevil.
Time will tell whether these decisions are sound. How do you feel about the costume and its departure from the DC comic? Let us know!
