The GoW franchise actually has a surprisingly good story that has quite a bit to it. The reason the past games don't get much credit for their story is because of their over the top cartoon-ish characterizations. Especially of Kratos.
This is something people who only watch snippets of the game on Youtube will never understand.
The cartoonishly over the top nature of the characters is both explained by the story itself and by the source material. God of War accurately represents the tone and characters in the Greek mythology.