Eh, I don't really like it. Pantheon is my favorite champion, and I was digging Atreus. But Atreus doesn't matter. It specifically calls that out. It could have been a bunny on top of that mountain, it doesn't matter. Pantheon arrived on the mortal plane and became Pantheon, some weird god thing.
I would have much preferred if we actually got to flesh out what Pantheon was. A badass warrior from a warrior tribe that is now undergoing a complete religious transformation. How does he react to the new gods? What are his goals, real goals, like who does he go to war with, what does he stand to gain from his life, what does it mean to be a paragon of his people, what is the story of his ancestors relic weapons, will he live up to them? Those are all questions that could have been great to flesh out who he was.
Now we waste a lot of time fleshing out Atreus (and I admit I really liked Atreus), but so what? Atreus is dead, and we learned nothing about Pantheon other than he's a dangerous god that likes to fight. So what? That's not interesting. That's just a power fantasy.
Ehh, I know I'm bitching, but I really don't like the changes that have been made to my favorite character.