I don't know who invented the movie industry phrase, "it has legs," but "American Hustle" is proving to have just that, still in the top ten the third week of January. The moviegoing public has latched onto it: all the quirks, the flawed characters, the ironies that don't hit you over the head, even the muddled international angles along the way. People like that these days. In his book "Bunch of Amateurs," Jack Hitt pointed out that us Yanks, all the way up to our president, will try new things and be first-timers, make it up as we go along, stumble in the process, and somehow succeed. "Gravity" and "12 Years a Slave" are very well made, but "American Hustle" sticks with us.