Boring first act, excellent middle act and terrible last act. The callback lines ("If it bleeds, we can kill it" and "Come on! Do it!") were eye rolling. Also, it made zero sense how Naru figured certain things out, such as the fact that the predator uses heat vision to see its targets and that the predator's helmet uses a homing targeting system. The ending was abrupt and anti-climatic.
It was a very well directed movie though and there were a few very good scenes during the middle act. For what it's worth, I'd rate this as the third best predator movie (after Predator and Predator 2) but there's a sizeable gulf between those movies and this one. Overall, I rate the movie as a 6/10.