I'm gonna hafta take a tight stand on this one...
I hear a lot of women saying "Oh he's a great dad, he was just a lousy husband" (one more time and I might have to speak this out loud)... a man cannot possibly (and most definitely does not) love his children if he treats their mother like shit...
If you feel even the tiniest spark of joy in the presence of your children then you owe that blessing to the woman who made them...