I don't agree with you. It seems to me that there have been three Batgirls (more or less). This had all three show up, and guess what? Babs and Cass were both mangled. They're putting Spoiler in the costume, but they're simultaneously showing us that when it comes to Batgirls, the characters tend to get screwed over.
If they can't be bothered to give us a good portrayal of the previous two Batgirls, why should I put any emotional investment into the new one?