My next reading from this list was a great improvement upon the first:
"Sarah Canary" by Karen Joy Fowler
A beautifully written, philosophical work set in late nineteenth century America that explores issues of racism, sexism, mental illness and exploitation of the time.
Sarah Canary, so named by one of the central characters of the story, appears out of nowhere to blaze a path through Northwest America and the lives of the people she encounters despite not being able to understand anyone, nor speak intelligibly herself. Her origin remains a mystery throughout and it never becomes clear why she seems to have such a magnetic effect on those she meets, nor why everyone she encounters seem to project their own ideas about who or what she is.
I'm not so sure this is even a science fiction story at all although I accept it is one possible interpretation. I just think there is very little in the story itself to suggest this interpretation in particular. Whether Sarah Canary is or is not an alien doesn't really matter though, the important thing is the effect that she has on the lives of the characters she encounters and the way they come to understand themselves.
So, all in all a very good book marred only slightly by a somewhat weak sense of direction. I am definitely keen on trying something else she has written.