Sacrificing nerd credibility, I'll admit that of the three authors included in this collection, I was only familiar with George RR Martin. This made for an uneven reading experience. Even with introductions to get the reader grounded in each fictional universe, there's a tricky balance here to giving enough context for the story to make sense within the limited scope of the short works while not boring those who are already familiar with the universe, so the volume was a bit uneven.
Goodkind's Debt of Bones was probably the weakest story, but only in comparison to the others. It suffered most for the form- from awkward exposition shoehorned in as dialogue to the nagging sensation throughout that this would be far more interesting if I had read Goodkind's other books.
Martin's The Hedge Knight (more a novella than a short story) was a delight. Not sure how to talk about it without spoilers, but it's vintage George RR Martin: fully realized, fascinating characters, intrigue, high drama, and of course unanticipated deaths that leave you clamoring for a) the author's head and b) more stories, please.
I admired the world building in McCaffrey's Runner of Pern, but was ultimately disappointed that it served as a backdrop for a rather pedestrian meet-cute romance. Of the three stories, I was most interested to learn about the world of Pern, and instead we get a harvest festival and the charming and handsome son of a noble falling for the plucky and tempestuous runner... meh.