I think there's plenty of blame to go around: Morrison for not being cooperative with his fellow writers and editorial for lack of planning and a failure to ride herd on Morrison and other "star" writers.
In fact, this has been a complaint I've had with DC (and Marvel) for at least 10-15 years now. Editors are supposed to edit. They're supposed to give constructive criticism and serve as a second set of eyes to make improve the writer's work. However, these days, editors seem to either micromanage the writers or not manage them at all.