'Rebel Moon - Part One: A Child of Fire' is an enjoyable ride!
I will say that I wasn't ever totally engrossed into the story, though at every moment I was still very interested in what I was watching unfold - and for a movie that has a run time of around 134 minutes, that's a big plus. I particularly liked the world building, as well as the special effects.
Sofia Boutella is a great choice to lead the ensemble, her performance is one that I thoroughly enjoyed throughout. Ed Skrein is solid in a, shock horror, antagonistic role (does that geezer ever play a good guy?), I've found him quite meh in other movies but here he is very much a positive. None of the others onscreen stand out on their onesies, though as an collective they are a fairly strong cast.
I genuinely had a good time with this, can't ask for more than that. I'm fairly lukewarm on Zack Snyder movies, this is the seventh of his work that I've watched and 'Man of Steel' and this are the only ones that I'd actually class as exceptional. Unlike many others, it appears, I look forward to checking out the sequel.