The seven space samurai are fighting the space Nazis in spaaaaaace! #RebelMoon
It's worth watching for the super real android in the first act. If it was full CG then... wow! But even if it was a practical suit and they replaced the actor's neck with CG bolts and pistons it looks amazing (the robot from Lost In Space was done that way).
Story-wise it goes downhill from there. It's a mix of 300, Dune, Warhammer... an All-You-Can-Eat buffet of visuals and characters.