The book is dated. I'm quite sad about that. I read a number of Elizabeth Ann Scarborough's books about twenty years ago and I have really positive memories of them. "The Healer's War" dealt with the Vietnam War, and her godmother series was interesting in the weaving of fantasy and social commentary.
I should have read "The Drastic Dragon" back then -- only it wasn't in any of the shops here or the library.
Reading it now, it just didn't work for me. I guess my sense of how you portray history, the sensitivities of it, has evolved since the book's original publication in the 1980s.
It's an interesting read. It might work really well for you. Am I damning with faint praise?