stephenrdonaldson.com/fromtheauthor/page.php?Page=4
Personally, I can't stand her. Here's what I said a few years ago:
When the chips were down, she was reckless, arrogant, and stupid. To disregard Amok, a being of vast experience and knowledge; to presume to know better than Kevin, who knew far more about power than she did; to dismiss Covenant's concerns... Without stopping to consider for five lousy minutes, she gives a Command that is based on her fantasy that "there is immeasurable strength in the consummation of despair - strength beyond all conceiving by an unholocausted soul. I believe that if High Lord Kevin could speak from beyond the grave, he would utter a word which would unmarrow the very bones of Lord Foul's Despite." She never thinks, "But is it possible that I'm wrong? Could it be that Kevin is not be as powerful because of all that as I've hypothesized? Maybe I should reconsider before I take the chance of screwing with horrible consequences that Amok warns of."
As for THOOLAH... Before the Final Chrons came out, I was a member-in-jest. Yes, she was as annoying as any character in literature. And yes, I did want Covenant instead of her. But she was only the main POV for part of one book. And she did grow into a hero. And she was very important to Covenant, and the entire Second Chrons.
Then came the Final Chrons. Now I just hate her. But I've said why often enough in the Final Chrons forum. No point in getting my blood pressure up again.