Are audiences getting weary of blockbuster movies? “Except for “Finding Nemo,” “Bruce Almighty” and “X2,” virtually every mega-movie released since May has failed to live up to its hype at the box office – if it hasn’t tanked altogether. And even some movies with record openings – like “The Hulk,” which set the all-time mark for June – suffered steep second-week drops (70 percent for “The Hulk”), suggesting audiences are suffering from ever-shorter attention spans. Overall, ticket sales this summer are off a whopping 7 percent from last year.”