I agree, I loved the world building.
Did you notice the little line that mentions
Spoiler
the multiverse? The Rage were experimenting with theories which included "multiverse balancing"
As for the Predator devastations, I felt the true damage was coming at the end and mainly happened off screen. The Yautja began attacking colonies, space stations, marine ships, civilian ships and even freakin' space pirates!
Overall, what did you think of the portrayal of the Yautja? I know you aren't a fan of Perry's Yautja, but what did you think of Lebbon's take? I loved how independent and solitary they were, he also implied they were nomadic and tended to gather together for a big hunt or in this case, a war. He kept them very alien and the human characters acted like us, guessing and speculating. They even guessed Yautja may have stolen tech while others said they developed them independently and advanced quickly (such as the cloaking, when we steal theirs, they come back with something better.)