Bah! All that money. All that effort. All that time. Try something new. It doesn't have to reinvent everything... but dammit, just try a few things. New spaceship designs maybe? Different clothing? Stay away from desert-scapes? Stay away from "The Chosen One" storyline? Try some new droids? Don't use lightsabers?
I could do this all day....
It’s fine to have this reaction and to express it. But it definitely doesn’t define what Snyder has done as good or bad. It’s just not what you personally want from a sci-fi film that’s being marketed as the next big franchise.
George Lucas has given many interviews over the years explaining how incredibly derivative A New Hope is. Look at this list of inspirations that Lucas drew upon for that film:
Star Wars sources and analogues - Wikipedia. (Seriously, it’s worth sifting through!) He first wanted to remake Flash Gordon, essentially. It mushroomed from there. Anyway, Star Wars is a hodgepodge in the same way that you’re criticizing Rebel Moon.
Snyder is very much into commenting on genres, he does it all the time. For example, BvS is deconstruction very much in the spirit of Watchmen which is itself a commentary on superhero mythology. What that mythology means to Alan Moore and to Zack Snyder, respectively, is quite different. They agree on some things and disagree on others. But anyway, I think with Rebel Moon Snyder may be saying something like what I’m observing: we do in fact use the same mental templates over and over, for reasons that C.G. Jung and Joseph Campbell identified. Like, yes, mythology gets retold over and and over! There’s also a sense in which creatives themselves, personally, are always retelling similar themes that matter most to them over and over.
I’m looking at the film that way, so it’ll be satisfying to me I’m sure. But if what you wanted was something fresh that we’ve never seen before, then yeah, it’s probably not going to be so great for you. Those of us that can appreciate the film that’s actually there, and are able to appreciate it for what it actually is, should be eatin’ good though!