Its fair to say that Orson Welles didn't have a great deal of luck when it came to Hollywood. If his films weren't being reedited without his permission they were being shelved and cancelled all around him. Eventually moving to Europe Welles could have spent the rest of his life sulking; only he had better things to do, make more films.
F for Fake is something of an oddity even by Welles' standards. A kind of film within a film, F for Fake is an exploration of art and film itself and before anyone says anything no it is not pretentious.