Honestly, Kristen portrayed Bella perfectly in the Twilight saga. If any of you have read the books, Bella is written as a very blank character. She never feels or shows much emotion. This is a (sadly) popular concept in a lot of bad young adult romance books because it supposedly lets the reader picture themselves as the main character. Kristen just followed what the books portray Bella as, and did a damn good job at it, actually.
@Orange Sherbert, as much as I hate twilight, none of the actors are necessarily bad for starring in it. Having the best actors portraying poor characters don't make the characters good.
@Orange Sherbert, oh great the "I have zero emotions" anime trope is bleeding into American culture.