I just finished the book...it wasn't bad, but with you all saying how they changed it, I will most likely wait until it's on HBO to see the movie now. The end (as you all are describing it) sounds far more anticlimactic than the book.
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Adam and Eve were lucky, neither had a mother-in-law.
I have not read the book, but got the spoilers from Wikipedia. I do not like one major change they did that is just in the movie. There was no need to degrade Andrea by having her engage in that. I am being vague for those who have not watched it, but it was not really necessary.