I really liked the prequel novel, it was fun to watch, and only the last quarter of the ending fight felt a bit too long.
All in all, it was interesting from either sides. It gave a glimpse of the predator culture / ideology (based on this book I thought the whole dna stuff could work, even if it was mentioned in only half of a sentence), but nothing detailed. There were some great parts, my only question was why they had to use the word yautja. But it's just a minor issue. The cloaking was fine, I'd say in the last fight. Pred tech evolves too.
The whole Stargazer line, the Reapers and the politics behind it was awesome and exciting. Trager's character seemed really good and interesting, but Pappy gave most food for thought.
The whole build-up was great. And also connectible with earlier but later movies, literature too. If you have read Hunters 2 already, you know what I mean. Stargazer can be a really good addition to the pred universe, I hope we'll see them around.