There's a big difference between wanting to move and inspire people and actually doing it, and "Walter Mitty" can't quite pull it off. It's not because of a lack of effort but quite the opposite: It tries too hard, loading up on upbeat folk rock hits, meaningful quotes and carpe diem lifeisms without any nuance or ever really earning the emotions involved. For all of the movie's sincerity and creative direction, it ends feeling as empty and vapid as YOLO.