I love it when you like a character, and then she does something you don't like, and you hate her for a while - then you love her again. I'd like to see her have unlikable moments that the audience understands and sympathizes with.
My main goal as an actor, with my craft or whatever poncy way you want to say it, is to always take the audience with me. To make them feel for me, or to make them hate me, I want a reaction. I want their emotions. The worst reaction someone can have is, "eh."