I mean... When it comes to villains it's a bit weird. I like Kai Winn as a villain because she's so hateable. If the bad guy doesn't make you want to punch them in the face, they're not a really good bad guy IMO.
I also like Naraku from Inuyasha because I hate him so much.
Even before that, she is rightly shown as a political go getter, trying to use her position for a higher position. She plays from strength and weakness well.