Yes, it's been done before. However this is clearly a movie for fans of this category, not for people expecting something new. I mean, the trailer makes that obvious so don't watch it without that common sense or you're just looking to complain about a movie.

It's not the best found footage style, but it's still good. I like that the themes challenge what's real and what isn't. Do you believe something so badly you're willing to ignore possible contradictions? If you're an artist, are you telling a story for the sake of educating, inspiring, or forcing the story to go a direction it shouldn't (like Gavin)? I like that the main character was determined to foolishly pass the tapes off as real instead of letting the audience view and enjoy it as whatever they decide it to be...like this film overall! The creator/director isn't attempting to pass it off as real, at least not in the movie credits. Don't know about imdb credits.

If you're a fan of this stuff, it's not bad. Wouldn't say it's a 10, but you'll enjoy it.