Way better than 18% RT score indicates
I've been fascinated since the first previews came out and finally got a chance to watch it. I cringed a bit renting it with a RT score of 18% but it was actually pretty good.
For a genre type movie it was above average. My only real criticism was that it was about 45 minutes too short, the universe and its backstory could have had more exposition. But the pacing was good, the story coherent and a nice mix of action and mythology and not too much saccharine family emotion.
I don't quite get why it has been panned so much. There are movies with RT scores in the 60-70 range that suck hard in some way or other.