Advice: don't go see this movie if you're looking for Something like That Thing You've Seen Before; *this is not that thing*. Don't go see this movie, in other words, if you're nervous about things like "Clearly Delineated Plot Structure" and/or get overly hung up about things like "Strictly Adhered-To Genre Conventions" -- if you do, well, you'll have only yourself to blame.
Go if you want to feel something new in cinema for the first time in a very long time; go if you want to laugh hysterically (if sporadically)... at the very moment you're feeling a vague sense of horrible foreboding that this film might actually somehow be a documentary that was sent back from the future.
Because this is a breathtaking and utterly novel piece of cinema -- it's as if a post-Repo Man concept by Alex Cox was written up by George Saunders... and then re-written by a coked-up, paranoid, fever-dreaming Craig Baldwin... and then handed over to the Yes Men to improv, and thereby render even more astonishing. (And yet don't misunderstand me via that mash-up: there's *nothing* derivative about this film.)
Whether you ultimately decide you don't need a thing like this in your life (like some of the low ratings would suggest) or, like me, find it instead a Cinematic Hope Rejuvenator, one thing is certain: the whole of it is like nothing else you've seen.
So, up to you: wanna be first to the party, and anticipate you kids' reverence for this film by about 15-20 years? Or wanna memorialize your head-scratching and confusion here with a negative review? :)