Most every figure in Greek Myth is a douche. Cronus' father was a douche (forget his name) and then Cronus was a douche and then Zeus was a douche.
Kratos is a murderous scumbag who hasn't been sympathetic since God of War 1. His quest for vengeance has long since been forgotten and now, as Yahtzee said, he's just killing the people who actually give him what he wants.