In this film publicity image released by Paramount, Dev Patel plays Prince Zuko in a scene from 'The Last Airbender.'    (AP Photo/Paramount, Zade Rosenthal)AP – „The Last Airbender” is a joyless, soulless, muddled mess, but the worst part of all doesn’t come until the very end. That’s when it makes the clear suggestion that two more such movies are in store for us.