Are you fucking kidding me. Kratos was mass murderer in his past he had no humanity until he killed his family and that has been touched on in the first game, and Chains of Olympus pretty good actually. Is he suppossed to become a loveable character? Because he seriously is not. The defining Kratos scene was when he went into hydra to get the key. I mean this is Kratos, he is the only real Anti hero we have.
But this game has some flashbacks or some visions that will explain better the relation between Kratos, his wife and his daughter.. so no, i'm not fucking kidding you(as you americans like to say)... maybe you don't even know what you are talking about or maybe it's so hard to understand what i mean lol XD