My H and I watched it together. I too saw the wife get off easy for her EA.
I think they were trying to high light somethings that distroy a marriage and did a poor job in not explainning more. Porn addiction, EAs , unexpressed expectations, how each felt the other did not treat them well, and so on.
The fight was very realistic and the way they treated each other and talked with each other seems closer to reality more so then mainstream movies portay.
The Love Dare is about changing your self and how you treat your spouse, making an effort to make things better. It is not about doing it together because it is about making changes of ones self that might produce a desireable action out of spouse and a change in the way things work between the couple.
There was a lot of silly stupid stuff in it and the movie was to promote then book (I heard it was based on a true story) well watching it did not change things for us and the part where he tells his wife he is sorry made me cry and made me wish my h could just pour it out like that to me.
Who knows the book may have helped some people change or at least form a habit of being better to their spouse then they have.