I watched it last night. If you're looking for animated action, violence and gore in the Predator universe, it delivers. If you're looking for more than that, you may be disappointed.
It's very formulaic. Trachtenberg took Prey and did the same thing in three more historical time periods, but shortened to 20 minutes each. On one hand, he gave a lot of fans more of what they wanted, which is commendable. On the other, not much creativity went into it and there isn't a lot of time for storytelling with the vast majority of each segment being devoted to action.
For me, the first half of the movie is the better half because it's more serious and mature and slightly more believable. The second half was largely ruined for me by the teenage pilot who doesn't stop talking, even to himself and to point out the obvious to others, and learns everything very quickly, even how to operate alien technology. He made the second half feel more like a cartoon targeting teens than the more serious animated movie targeted at adult Predator fans that the first half felt like.
This is more subjective, but I didn't like the animation, which is 3D rendered, then filtered to look more like hand-drawn 2D, kind of like the Borderlands games. I'm just not a fan of that and would've preferred either unfiltered 3D or hand-drawn 2D. Also unpleasant to me was the jerkiness of the animation, which I'm guessing was to try to emulate hand-drawn animation even more.
Anyways, I didn't hate it, but didn't love it, either. That's similar to how I felt about Prey. I imagine that this'll probably really appeal to anyone who liked Prey and probably not to anyone who didn't.