They make Trina seem weird and a side character, when I can tell the character created was....TALENTED! But...they make her seem weird, so Tori can be the main character.
Now lets talk Vega Sisters:
Tori was most likely talented since she was younger, Trina probably tried to be noticed, but she was the shadow of an over-achieving little sister. Trina could probably do SOMETHING, that made her talented, but it was never shown on victorious, she always made mistakes (Like when she made that chicken) But like I said in the begging Trina's has some talent. So give Trina some credit!