A lot of mothers are bad (almost all of them are bad in some way or another), but I would guess that on average fathers are worse, because males are emotionally colder, more aggressive, more about putting on a front of strength, generally more criminal and destructive, hard-headed, more likely to fall into any type of extreme imaginable, etc. And women by nature are softer, more emotional, more nurturing, like to resolve things through discussion before violence, etc.