No, the narrative isn't perfect. The script isn't perfect. There are narrative flaws and stretches of the imagination, but this movie is about stretching the imagination.
The concept - of an underachieving dreamer finally discovering the world - is something most of us can relate to. Accompanied by a truly beautiful soundtrack, Oscar-worthy camera work, and the surprisingly able acting of Ben Stiller, as well as an accompanying cast which includes Adam Scott, Kirsten Wiig and Sean Penn, among others, this is heart-warming and truly special.