Here is a very well-put-together summary of why this is the case.
(I actually wrote a college essay about why I hate the books for UVA, and I got in, though I'm not going.)
My favorite part:
Maybe it's difficult for Edward to see Bella as an equal because Bella has almost no personality. Meyer writes on her website that she "left out a detailed description of Bella in the book so that the reader could more easily step into her shoes." But Meyer fails to give Bella much of an interior life as well; Bella is a blank slate, with few thoughts or actions that don't center on Edward. If Meyer hopes that readers see themselves as Bella, what is it she is suggesting to them about the significance of their own lives?
Fun fact: Leaving out details does not make your story more relatable. It makes it poorly written. I learned that in freshman writing class.