Faye is growing up -- the most, I think, of all the QC characters. She has her issues, knows where they come from for the most part, deals with them as she can, and in her own way, helps others. Or at least she bullied Dora into seeking help. She has made efforts to expand her horizons with her art. She is the first of the major characters to showan interest in a child as a person. Additionally, she is in a relationship that requires work to maintain and for the most part does her share of that work. Even early on, she has recognized shortcomings in herself and tried to overcome them -- particularly, the day she and M. Checked out the new apartment, her disgust with herself over her treatment of Raven and her mostly successful attempt to make amends for it.
Some of the less forgiving forumites see Faye's failings as a reason to hate (a real person like) her in perpetuity. Whatever. I admit the 20-something version of me would have probably disliked a Faye, particularly if she made me her punch bag. The 47 year old version of me, I hope, would at least try to understand where she's coming from: I might even like her.
One more time I'll mention the difference between "liking" a character and appreciating how she's depicted. Faye is depicted very well and is used by Jeph as a vehicle for depicting personal development. He himself has said he probably wouldn't like Faye in real life, but he gives her some of the best scenes in that regard.