I like that they are flawed. You don't get the feeling that Ms Slaughter worked her way down a character list, ticking character traits off as she went.
They are troubled and unreasonable, they have petty conflicts and doubts. These aren't placed in the books as plot devices, they don't forward the story in any way. Yet because of these negatives, and funny bits we have real characters, not ones gathered from a central character shop!