Attached is a version which works with the B&N website after its revamp. As I mentioned above there is a few things broken on their website that I am not sure if/when they will fix so I want to give it a little more time before I officially release this.
From my quick testing, I "think" the plugin is fully working. There are some changes forced by their website changes. For instance B&N now only publish ratings in the web page rounded to a half star based system, rather than a numerical value like they had previously.
As an example, go to this url:
You can see it has a 4.5 star rating on the right-side - as for how it gets that value I welcome the answer.
Regardless, a version for you to test is attached to this post, let me know of any issues before I officially release it.