Fool's Run may be the worst thing McKillip had published, emphasis on the "may". That said, my primary objection was that the payoff was a letdown after the buildup. I liked the world building and the characters. I still do.
And, on the reread, I'm noticing a bit more about what she was trying to do. I expect I'll still find the second half annoying -- I recall, as with C. J. Cherryh's The Tree of Swords and Jewels, an awful lot of waiting around for, well, not much. But, the first half is still very cool.