My coworker and I watch every episode during work because we never have anything to do Sunday Night/Monday Morning, and we both just crack jokes left and right during Sansa sections because she just seems so annoying and worthless. He's read the books too, he said to me that, at least for him, most of the Sansa perspective chapters he was just like "Okay, crying and moaning upcoming." It's very clear that she's just a puppet, at least right now, and because of it I don't really care for her at all. I think that Arya and Sansa are polar opposites; all of Arya's sections are awesome and I care about her while I don't give two sh'its about Sansa at all.
Spoiler
Have you read the books? She is basically important because of her lineage and not much else. Yea, atm I do agree she is very annoying and naive. It's pretty funny in a sad sort of way