If they started with the original trilogy they'd easily have enough source content for 6+ seasons.
Aside from casting the right person for Kratos, it's going to be a tough series to truly capture the essence of the game.
The combat alone with the blades and chains is going to have to be very CG heavy unless they re-write it to be just 2 big daggers instead of the blades and chain combo.
I agree that in terms of acting Jason Mamoa makes more sense than The Rock.
I liked Black Adam as far it being a good popcorn flick but I still can't take him serious in any serious roles like playing Kratos would have to be.
If HHH was an actor he could pull off the look of old Kratos.
I'm cautiously optimistic for this series. I think The Last Of Us series has a better shot but I would love for God Of War to be great.