Twilight was a nice little novel. I read the series mainly for the character of Edward Cullen. It really bothers me too that Stephanie doesn't inject any feminism into the character of Bella. She seems as though she gets more vapid with every novel.
During New Moon and Eclipse, it bothered me that she kept
hurting herself. It was the same thing over and over again, she hurt herself and Jacob/Edward came to her rescue. Why can't she save herself?
The reason I liked the character of Bella in Twilight was because she was so incredibly persistent. Although she found Edward to be an intimidating figure, she still stood up to him and demanded the truth. That was the reason why I kept reading the novels, for the dynamic between Bella and Edward.
Personally I think Stephanie pushed the Jacob plot a bit too much. I understand that he saved her but the same cycle over and over again got really boring and irritating.
However, I kept pushing myself to finish New Moon and Eclipse because some of the Bella + Edward scenes really were gems in the rough (can you believe I just said that?

)
I agree with Kissmesweet, Stephanie's writing is really generic but she's created a modern romantic superhero in Edward Cullen.