I agree with you that Kennedy was actually a good character. Admittedly, when I first watched season 7, she struck me as a sort of pushy distraction much as all the potentials did, but re-watching episodes like the "Killer in Me" have given me a whole new appreciation for her. On the other hand, my loathing of Andrew continues unabated. As part of the Trio he did evil that he remained consistently unapologetic for, he killed his supposedly best friend and, his tears at the seal not with standing, his turn to the light side of the force seemed mostly about fitting in with the cool kids than any actual moral shift. Moreover, he was clearly meant to be a sort of Xander replacement without any of Xander's charm, loyalty or social redeeming value.