If it's crap ... We'll tell you
You read the question. Given how horribly written she is as a sympathetic heroine, she can be easily reimagined as a villain. when you look at her through this lense then she can become quite compelling as a commentary on the petty evils of young women.
In that regard, I find more compelling than Lord Voldemort. Bear in mind, this is intended to compare villains of similar popularity with the mainstream.
So is she the villain, and if yes, how good a one is she?
Unintentionally, pretty damn good. In Twilight 4 Part 1 she makes all men in general look disgusting.
lol at people trying to find an excuse to like Twilight.
Let me make this evidently clear, I hate what Twilight is to the core of my being. But there are elements of it that are SO BAD it is unbelievably fun. It's like a gift for trolls. What amuses me most is how Stephanie Myer managed to write a better villain accidently than write a protagonist intentionally.
I hate what it's supposed to be, but find what it actually is quite enjoyably off the mark and funny.
Villains harm people we like. So no, she's not a villain.
Stephanie Meyer is though.