It's an interesting premise, but it unfortunately falls a bit flat and misses the mark on quite a few points in my opinion. The author comes off a bit pessimistic, harsh and disrespectful at times, but at the same time you can see where this might be coming from.
As an autistic man myself, I did enjoy reading this book and it did raise a few valid points in my mind in regards to my marriage. It's interesting to hear about potential shortcomings from an external point of view.
I did not however appreciate a few other points which I found to be generally false or condescending. Things like "he will take you and the relationship for granted", "just as the relationship progresses, he might get bored", "[some autistic men] knew they were being cruel but didn't care, suggesting a certain emotional detachedness", "stop calling him entirely to make him intrigued", "his moral compass won't always point north", "aspies are good liars", "they may blame you for something that is their own fault just because you are there", "he will put himself first", that an autistic man may feel ineffectual in times of crisis and think "why bother?" and not support you, "he will not care about the things you do without him"... you get the idea.
A strange and conflicting read, but an interesting and still a useful read that I would recommend, only with a few caveats. Decent food for thoughts, but to be taken with a healthy grain of salt.