A note of warning : if you're someone who's only seen a couple of Coen Brother's films and expect "a typical Coen laugh-fest," as one review I read put it - fix that assumption. I don't understand this continued point of view of Coen Brother's movies given how NOT straight comedy most of their movies are. Because Fargo had a couple of moments of really dark humor it's a "laugh fest"? Miller's Crossing? Laugh-fest? really?
Anyway - reviews of this movie tend toward the bad when the reviewer is someone who prefers a standard movie outline and feels they didn't get it. Or when they prefer a standard "satisfying" conclusion to various story arcs and feels they don't get them. Ignore anyone who explains this movie to you. They probably have no idea what they're talking about. I'm not saying I do - I'm saying it's probably more about what you get from it personally than anyone else's interpretation.
But I say you should see it if you can manage to keep from dozing off because of how awful and slow and boring it all is. Hell, I'd be surprised if you made it through this post.