Uh... Short stories... Hard to get anywhere near the amount of detail and complexity that I look for when I read something, in a short story.
The first one was OK, but not much more than that. The next three and the sixth were average at best. The seventh was odd and nothing more. The last was actually a bit disturbing... The one I liked most was "Time of the Tree", but most likely just because it treats the problem of humans destroying the Earth than because of the way it was written.
In conclusion, decent for a collection of short stories, but not much more. Really dampened any interest I might have had in reading the Mythago Cycle.