IRON MAN 2 (2010, directed by Jon Favreau, 124 minutes, U.S.) BY DAN BUSKIRK FILM CRITIC Much of the thrill that greeted the arrival of Jon Favreau’s Iron Man two years ago stemmed from the surprise that it wasn’t another Marvel disaster like Ghost Rider or Daredevil, two wannabe blockbusters that seemed to signal a creeping exhaustion in the unstoppable super hero genre.  There’s nothing in Iron Man 2 to replace the surprise of Robert Downey’s smarmy charm finding a perfect fit in that gleaming red and gold suit, but if this sequel is distressingly short on imagination it still […]