Kratos is a far more complex character people give credit for and anyone that says "the new game finally made Kratos a complex character" is dishonest at worst and ignorant at best.
I played all the GOW games as I grew up, from the PS2, PSP, PS3 and PS4, I was there. And Kratos's story is one of tragedy, of the greek kind. Kratos isnt meant to be a modern hero but one of old, one that were recognized for the epic of their deeds rather than the morality of them.
Kratos grew up in an extremely cold and brutal world. One where if he hadnt become tough enough to survive said brutality, he would have been killed very young. Without mentioning that the greek gods are uncaring at best and borderline self servicing malicious monsters at worst. Kratos doesnt think of himself as a good person, all that he cared for a while was his nightmares leaving him, which the greek gods he faithfully served for years refused to do...then thought that the best way to reward a clearly disturbed man is with god like power. Of course Kratos would use it with bias towards Sparta, especially after the events of Ghost of Sparta where he lost his brother thanks to the gods trying to save their hides from a prophecy (but ended up only sealing their fates long term). Kratos enjoyed the power of a god but hated of what it meant. He wouldnt be an indifferent being like them, he would fight for and alongside his men. We see that Sparta adored Kratos as their god.
Besides, when the gods did intervine, it turns out it was hardly out of the kindness of their hearts or for some desire to stop Kratos from upsetting some sort of "balance", it was simply because Zeus feared Kratos and wouldnt stop at nothing to see him and all he knew destroyed. Zeus officially declared war on Kratos and Kratos declared war back on Zeus, even if that meant it was now him vs the rest of the world.
GOW 3 is basically Kratos, a used disturbed tortured unstoppable soul cursed/rewarded with god like power, fighting back at a cruel world that always held the whip. His only target is Zeus but he made it clear that anyone standing on his way would get the same treatment and its not like most of his foes didnt have chances to simply step out of the way. Hermes and Hercules are the biggest examples of, Kratos tried to dismiss the former and convince the latter to stand aside. He only fought when they both made it clear he would have to kill them first. And, well, Kratos provides it. The story doesnt portray Kratos in a moral light, in fact, its clear that at this point it is a tale with no "heroes" to speak of, but looking on the grand scheme, Kratos is simply resetting a broken world that the greek Gods gladly kept that state on purpose. He kills innocents both directly and especially indirectly by killing most major gods but its clear that he ceased caring at this point. The Gods started a war, Kratos would end it. Kratos doesnt make any pretence that his quest is a noble one, its one of revenge and it will come no matter the cost.
The reveal Zeus was motivated by fear feels like an excuse plot device to somehow tie back the events of the original game and explain why the gods did this but even in games set before the first game, the gods were hardly any better. Maybe fear put Zeus over the edge but I honestly believe this situation was inevitable, it was only sped up at most. There is also the possibility that Kratos himself was affected by fear, thus why his brutality increased substantially in the games past the first one.
I feel like the ending of GOW 3 is the proof that Kratos is still a man deep down, a deeply flawed one but one that knows what needs to be done, even if it includes killing himself. He spreads hope into this reset world, making sure it would eventually recover and possibly better now the greek gods wouldnt get in the way. A world ran by men and not uncaring divines, far from perfect but clearly the best option out of the two.
Then we get to the new one and Im glad the story doesnt show Kratos's actions in a negative light, even Mimir states that the greek pantheon deserved what it got and a vase in Tyr's Vault implies that the greek realm did eventually recover and may even portray the events of GOW 3 in a positive light, as, again, a necessary evil to free mankind from their gods and their tyranny. The new one has Kratos away from the broken world that fed into his disturbed state and its obvious that the decades were healthy for his mental state as he is a far more controlled invidual, still very much aware of what he did and what his rage could do again if its ever unleashed fully. And someone who is afraid that the nearly uncontrollable rage within him might take over his son.
But hey, its far easier to describe Kratos as brutal idiot in the previous games and just say he has more complexity in the newer one, that will surely get views on your beta casual gamer journalist site.
Jeremy Soule destroying your eardrums is part of the TES experience.
Its Jeremy Soule, he destroys your eardrums with sheer talent.