He is either mindless, or a corporate propagandist
Walter Mitty is supposed to be a journey of self discovery. But how does Mitty discover himself? By traveling the world! And how do you travel the world? uh, with money? YASS! With money!
The tourism industry thanks you, mister! Those who will be inspired by your movie to find happiness and stuff, will buy tickets to Thailand, Spain, Brazil, and other nice destinations, if you know what I mean.
Greenberg on the other hand, is a honest portrait of a man struggling to live a healthy life. No consumerism. Directed by Noah Baumbach.
Ben Stiller is either clueless or a willing participant - to participate in a consumerist ad such as Walter Mitty movie...