So far this year, all the big blockbuster action movies - like "A Good Day to Die Hard" and its slightly more tolerable cousin "Olympus Has Fallen" - act as though they have a license to kill brain cells. Worst of all, they only provide marginally diverting action to make up for it. Now there's the long awaited "G.I. Joe: Retaliation," the most mind-numbing of the bunch.