As much as I liked the games, you do have a point. But, there aren't many writers who think as far as you do.
It is extremely hard to nigh impossible to make a story with NO plot holes, NO mistakes, EVERYTHING PERFECT while it needs to appeal to many people ALL AT THE SAME TIME. I know, as I'm a writer myself.
That moment where you blamed a quote for needing to be in children's stories? Maybe the writer genuinly felt good in putting that in the last game. I thought it fitted. It's among the things that kept Kratos going: hope. And I feel bad for saying it again, but it needs to be said: opinions. I dare to bet the writer of GoW 3 thought she did a good job.
If you want gaming to be at their full potential, you need to clone yourself, because it will be impossible otherwise; you can't just cram your idea's in another persons head. Imagine if you came onto my desk and started critisizing my book and how you think it's bad and how I need to change it, but I felt good while writing it, and I won't let anyone tell me what to do. Critisizing is fine, but telling someone what to do isn't.