This year’s Fourth of July blockbuster, Hancock, opens today. The quasi-comedy stars Will Smith as an angry homeless man with superhuman powers who causes massive property damage whenever he clumsily tries to save the day. The media has it in for him, but after he (tragically) rescues a publicist from an oncoming train, the grateful flack (Jason Batemen) helps him with an image makeover. The Times’s Manohla Dargis, of all people, calls it an......