Limitless should be so much smarter than it is. The movie is about a down-and-out guy who takes a “smart pill,” then can instantly write a book in four days, learn a language in hours and run rings around lawyers, criminals and financial advisers. He’s a Mega-brain on steroids, a Superman for the Information Age. He is also a comic reflection of a cultural shift in American perceptions of masculinity that is beginning to value a Bill Gates or Steve Jobs more than a Kobe Bryant or LeBron James. Alas, the filmmakers don’t use him very smartly.