As far as Ash goes..have to keep her age in mind, if I'm not entirely mistaken she is still really young. Hormon raging teen, in a world she doesn't have a clue about.
Robbie struck me as ruthless more so than really evil. He's ambitious much like Marafice but with more of a brain. I don't know, I didn't feel hate like with Mace. Of course, he also didn't have as much "storytime" either and may yet grow into something in book 4.
Raina, I just believe really didn't know what to do to back her words up. At the same time, she was too concerned with her status, kept being intimidated and shoved around. Her frame of mind was out of whack for what she needed to do. From a character/story point of view it makes sense that she wouldn't really do something until pushed too far but I personally do feel she should have acted sooner. Had wished it, I should say. I really wanted her to tear the skin from Mace's body haha
Now however, we (hopefully) get to see one hell of a show
