It's brilliantly designed, but exhaustion and impending doom haunt the boy wizard's eighth and final adventureOn 18 November 2001, I began my review of the first Harry Potter movie: "It's difficult to separate the film of Harry Potter and the Philosopher's Stone from Harry Potter the phenomenon – that astronomical budget; the producers' worldwide deal with Coca-Cola; the billion dollars-worth of associated merchandise; the actors' complaints of being exploited by Hollywood; the declaration by its director, Chris Columbus, that JK Rowling's novel merited the respect accorded to Shakespeare; the endless opinions on its significance ranging from world premiere guest Brooklyn Beckham to newspaper moralist Melanie Phillips."A decade on, we have reached the end of what we now call "the journey".