You must've seen a different movie.
No, I understand that opinions can differ. I loved it, and I would like to see it again sometime soon. I did think it offered a new whole. Yeah, everything has been done before, but that's basically with every movie that comes out. It's the combination of elements and how it is formed that totally intrigued me.
And you can say that they didn't keep a straight line by starting as a documentary and ending in regular story telling, but I myself liked how the two blended.
But I guess that's the thing. You never know how you're going to react to a movie. I recently recommended Monsters vs Aliens to somebody, and they didn't like it at all. But I was just in the right mood for that particular kind of movie. Moods matter.