I'm Feckin roasting but will do my best...
I believe essentially tht bad marriages are bad for everyone within them, including (especially?) children.
As to why women do better out of marriages, I think the reasons are hard to unravel. Firstly not all divorced men are unhappy, clearly. We're talking about a trend. SOME men will be completely happy post-divorce. I love Dadthelion's logic that the men who divorce feminists and are therefore held to account are happy.
Marriage/coupledom isn't for everyone. But men are sold the marriage message as hard as women. Maybe they find it harder to adjust post-divorce?
And I already made the point about women holding the social threads in their hands - as part of the wifework often - but when marriages end, men do find themselves without the social network their wives nurtured.
There's also the much-quoted tenant that men who have children in the workplace are seen as successful, young and virile. Surely the reverse must be true?
And of course - and again this is a trend rather than getting into specifics - men usually have less access to their children after divorce. This is not a 'what about the menz' post. Usually if men have less access it's because they haven't put the time in/have been a shit in other ways. But not seeing your children - no matter what the cause or whether it's justified must have a significant impact on happiness.