I watched “The Man from U.N.C.L.E.” (2015) with my mom, who is old enough to remember the 1960s TV show. Her assessment? “I liked it, but I don’t think young people would like it, because it’s too quiet.” What she means is that while it’s an action movie, it’s not a video game or a comic book. It’s an actual spy movie with an actual spy plot, human-scale action sequences, and a stylish level of subtlety and pacing that might come across as “quiet” to an 83-year-old woman. Or “boring” to a 16-year-old boy; thus its box-office struggles not surprising.