I liked the Immortals quartet. More when I was younger than now, yeah, but I liked the various immortals, and I wish other books had featured them as prominently. Intelligent nonhumans make things interesting.
It's the two big Trickster books that I despise. Gods, I hated Aly, despite having a name similar to mine. Look, I hate a heroine who's always uncertain, liked by people for absolutely no reason, and who has to lean on everyone, but apparently I also hate a heroine whose self-confidence is never, ever shaken. At least when she's the viewpoint character. I think I'd have liked her from the viewpoint of someone with some doubts. At any rate, those are my least favorite of Pierce's books, and I love Pierce.
Protector of the Small was my favorite series. *sigh* White Tiger seems cool. Naturally they couldn't use her.