Learn, understand, then decide whether you accept or reject.
As a Muslim, I wanted to understand how Islam is being presented to non-Muslims in an academic way. This is fairly accurate on the fundamentals, but there were several points I would have wanted to correct the professor at, especially in the second half of the course.
It seems to get things right when it comes to the major facts, and provides both perspectives of the split fairly well. It does a good job for what it is.
I found myself nodding to many points this book makes regarding the misconceptions about Islam that non-Muslims have. While some points can be questioned and could have been presented more clearly, in my opinion, it is a remarkable effort and Professor John Esposito did an admirable job.