Director Kathryn Bigelow may have won both of her Oscars for the 2008 film “The Hurt Locker,” but “Zero Dark Thirty” is her best project to date. The high praise for Bigelow’s newest feature isn’t meant to disparage “Hurt Locker,” which is a great film in its own right, but to underscore how powerful and affecting “Zero Dark Thirty” is. The movie is not only great, it’s a reminder that Oscar voters don’t always get it right.