As a generic set of laws for an extraordinarily diverse group of marriages, marriage law burdens some couples some of the time and benefits most couples most of the time.
Marriage law doesn't benefit anyone and causes nothing but trouble. 
mnli hypothesis: Marriage law doesn't benefit anyone and causes nothing but trouble.  premise: As a generic set of laws for an extraordinarily diverse group of marriages, marriage law burdens some couples some of the time and benefits most couples most of the time.