This whole thing is kind of like when you read a book and you have this image of the main characters in your head, and then you watch the movies and everything is totally different than what you imagined. At that point one of two things generally happen
1) the movie is really good and you forget about all of your preconceived notions of how things should be
2) the movie sucks and you are angry that they screwed up your beloved story, characters, setting etc...
If this had turned out to be the first case, I don't think we would be having this conversation about race.(well I'm sure some people would but not many)