Spoken like a true unmarried person. Marriage isn't some kind of magic lasso that binds two people together. It requires a lot of work, a lot of time and a lot of conscious effort to succeed at. But that's no different than any other relationship, whether it's boss -> employee or parent -> child. Marriage has always been for the unprepared, and it's only through the tempering of that relationship through time and hardship that familial steel is produced.
Divorce rates have actually been dropping to their lowest level since 1970. And 40 years ago, if George smacked Sally for not having dinner ready when he got home from work, no one would bat an eye. Would you say that Sally was "failing to live up to the challenge of a married life"?