I'm not sure if many people have read this specific review. Without more information about it, it's difficult to say what others' thoughts might be.
There could be a limited number of people who have read it if it's a relatively niche or specialized review. Maybe those who are interested in American history or the study of patriotic symbols might have read it. Their thoughts could vary widely. Some might appreciate the in - depth analysis if it provides new insights into the 'star spangled story', while others might find it too academic or not in line with their own views on the subject.
Since this 'Notgrass reviews our star spangled story' isn't a widely known or commonly discussed review in general circles, it's hard to gauge others' thoughts. However, if we consider the potential audience, say, among historians or educators. Historians might look at it from a perspective of historical accuracy and the use of sources. Educators might be interested in how it could be used in a classroom setting to teach about American history and values. But again, without actually reading the review, this is all speculation.