No, “American Ultra” isn’t realistic. But it’s crazy fun, partly because Eisenberg is perfect as an anxiety-ridden stoner who turns into a hero.
The script was written by Max Landis, son of “Blues Brothers” director John Landis, with Nima Nourizadeh (“Project X”) as the director.
Both have a knack for mashing up various genres and making it all seem original. And the ending makes you wonder whether a sequel is being planned. That probably depends on whether you go see it. And you probably should.