I have a hard time crediting Moore for work that Ostrander and Simone actually did. Shooting and paralyzing Barbara Gordon was in my opinion little more than a cheap stunt. The fact that other writers later made a silk purse out of Moore's sow's ear is beside the point. Further, and ironically considering this topic and the discussion of both Harry Potter and Watchmen, it was at least in part editorially mandated by editors who didn't think Batgirl fit into the grim n' gritty post-Dark Knight world of Batman.
The cover is a classic. The rest of the book is overpraised and has been since day one.