I don't like the twilight series - books or movies - but I think I need to interject a touch of reality here.
Folks, the Twilight series is TEEN Romance. It isn't "women" driving this, it's girls around the age of puberty.
Our (United States) market is aimed at that age. They've got a LOT of discretionary income. However, a basic market analysis will show that the majority of this is focused at boys, not girls.
Seriously. Look at ads, written and broadcast, and guess age and gender of target audience.
So what happened is that this hit a hole. There are better -- lots better, in almost any measure. But they weren't packaged or marketed, they didn't happen to be what caught the attention of some daughters and nieces and granddaughters of People Who Decide. And regardless of all other measures, the personal pressure from female kin is going to have at least as much weight as various experts with charts.
As to the series itself, for what it's worth my dislike isn't due to the sparkly pretty. It's the underlying story. The heroine is a rape victim, a passive sub to a bunch of heartless monsters who generally think of humans as cattle. The "loves" of the story are, from the point of view of their cultures, into bestiality. I despise that the message to girls is "be helpless, be passive, and if you do you'll eventually enjoy the ride."