A weak beginning for a strong heroine TV show Supergirl's pilot is a bad start. After what happened with "Smallville" people lose some hope for another Superman's TV show. Now, instead of Superman it was her cousin who took the show. The problem is that the acting and script is annoying as hell, very cliché. Also, most of the special effects are so bad, the trailer looked better. So, if there aren't good special effects (which is completely wrong due that it is a character that has lot of powers) it is expected then to have a good script or acting but there is none of that.
Making a superhero TV show is very hard, but talking about Supergirl which is the same as talking about Superman it turns to be almost impossible to make a good series because it will be very expensive and i doubt they have a high budget to do it. So, then again all will go down again as Smallville.