Kratos change in character was one of the most impressive things and ambitious things I've seen in gaming. It was done so seemlessly that you forget how angry, obsessed and brutal Kratos was in the previous games.
He still has the rage and brutality, but it's directed in a a controlled manner and it's for protecting instead of revenge. The journey you are brought through in this game is so so special.
I have nothing but perfect praise for this game.