The Class, directed by Lauren Calent and nominated for Best Foreign Language Film at the Academy Awards, has been called by critics “fierce, funny and moving,” a portrait of “conflict, tragedy and triumph.” All well and good, if you go in for that sort of thing. The Class is indeed a great film, but its particular greatness is obscured by its particular subgenre. Movies about young teachers trying to unite a class of underprivileged, ethnically diverse students are a bit like Slope Day acts — a new batch comes out every once in a while, and the audience reaches for the usual epithets. But what about when we get one we actually like? What then?