I truly enjoy Exit Through the Gift Shop. The movie is a complex work with many different ideas present in the same scene. The question left at the end of the movie, is exactly how did this really happen? Who was responsible for it coming out in the manner that it did? At what point did Banksy turn this into his experiment? Does Banksy directly lie to us in the film?
To say that the movie was a hoax would be to call it a lie, which the movie is not. I think that the factual elements of the movie are true, but we are experiencing the vision of an ironic genius at work and some of that slight of hand makes its way into the movie. I think like the fake bills made by Banksy, the film is real art, but also an illusory counterfeit. I think that Thierry portrays a character of himself in the parts of the film that were shot after the decision to base the film around. Thierry is a grotesque version of a artist who, although apparently lacking originality, uses his extreme determination, various connections and commercial instinct to reach monetary and popular success.
The most interesting thing about film is its sense of irony and tightly woven nature. The two main characters, Banksy and Thierry, are literally the perfect faces for what the represent, street art and pop art. Banksy is literally a black shadow with and indistinguishable voice. That this just came together unintentionally seems a stretch.