From all I've ever heard or read, Patricia McKillip is a tremendously talented author. Based solely on the three books of the Riddle-Master trilogy I have to agree. Based on her twenty-two other books, I have no idea. I've read the trilogy several times over the past thirty-five years but I have not read anything else by her, which is pretty sad. Some of them look really good. Oh, well, too many books too little time.
My mom took them out for my dad from the YA-section in the St. George Library back in 1979. She thought he'd like them and she turned out to be right. I only read them when he got his own paper back copies from the Barrett Book Trader. I would venture a guess that he read them half a dozen times from then until his death in 2001. I think I've read them three times. While I'm only a little way into the first book I'm finding it as engaging and well done as I remember it. It's always pleasant to find out a book enjoyed years ago holds up to changed tastes and age.