The ideal christian marriage is a thing of beauty. It's pretty much the same as an ideal muslim marriage, believe it or not. Unfortunately, people tend to have imperfections and are, on the whole, bad at equal power-sharing. When a philosophy dictates that stubborn differences must be resolved by one side (woman) ceding to the other (man), this is clearly going to disempower a hell of a lot of women and facilitate abuses of male privilege.
I read The Surrendered Wife alongside Venus & Mars, while trying to single-handedly make a good marriage out of a horrible one. It did strike me that both authors were basically recommending common sense ... and pushing it to nonsensical extremes. On investigation, it turns out that Doyle is a reformed control freak and Gray had been guilty of neglecting his wife. What they've really done is learnt a bit about how to do 'functional' in a relationship, then turned it into a cult.
The problem, imo, is that women tend to buy these books when feeling distraught about their relationships. By definition, they've taken responsibility for failings in the relationship and are looking to change it by themselves. Obviously this won't work, so they'll pursue each theory to the nth degree, going along with all the least sane extremes out of desperation. If the problems in the relationship come from a skewed power balance (and they nearly all do), her adoption of the books' teachings puts her in an even less powerful position, leaving herself wide open to abuse.
The only exceptions would be the very rare cases where the woman is herself the abuser and seeks to change. Laura Doyle is one such rarity. She's not 'fixed', though, because she takes it to crazy extremes. She'd have done better to learn assertiveness and NLP. But she wouldn't have made a fortune that way ...
Sorry: wrote a dissertation Can you tell I feel strongly about this?!