Deeply dumb. But entertaining.
A science fiction movie as directed by Terrance Malick, or a love story as directed by Stanley Kubrick. Not as difficult to understand as it's been made out to be, in that you should have no trouble following the broad outlines of the story (although the details may be nearly impossible to suss out without reading Carruth's thoughts on the matter). What it all means in a larger thematic sense, I'm not sure, but it's certainly haunting and affecting.