I'm more miffed at Sayaka being stubborn to the point of self-destructing, but I don't actually dislike her. In fact, I admire her unwavering dedication to trying to do the right thing, and her willingness to get the short of the stick to save Kyosuke. Even in the Oriko timeline, she proved to be good enough to step up and protect her classmates.
I jokingly made a remark in the PMMM thread on TV Tropes that I suspected Sayaka has a turn-on for Hurt-Comfort, which was why she was drawn to Kyosuke.