score:4
The book The Origins of Nazi Genocide: From Euthanasia to the Final Solution By Henry Friedlander discusses reception of this book on pg 16 (emphasis mine),
In the United States and Great Britain, where public discussion of euthanasia centered on mercy killing of terminal patients, and not the killing of unworthy life, the Binding-Hoche polemic made no impression. In Germany, however, it was very influential;
Note that worldwide discussion of eugenics at the time was mainly focused on sterilization or birth control to eliminate the undesired genetic traits, not euthanasia, which this work seemed to be mainly about.