One of the things that makes Bong Joon-Ho an interesting filmmaker, is the way he takes seemingly disparate elements and sort of mashes them together. Snowpiercer is a science fiction movie, first and foremost, sure, but it’s also an action movie, a comic book adaptation, and there are components of drama, horror and comedy as well.
He’s very good at juggling different tones and making them all work. Which is not to say that this film is flawless; there are a number of things you could pick apart here, but its constant creative invention, and it’s propulsive social commentary make it a very entertaining movie, undoubtedly.
I do think he’s perhaps a little more successful, thematically speaking, with Parasite. That picture just feels a little more cohesive, but he’s certainly never boring.
Also, Tilda Swinton is a treasure.