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“Spider-Man 2” was seen as superior to “Spider-Man.” Many enjoyed “Superman II” more than “Superman.” “The Dark Knight” doesn’t open until Friday, but already the sequel to “Batman Begins” is being favorably compared to the first film. Mark Caro reports that although most sequels turn out to be inferior to their predecessors, superhero movies operate under a different set of rules. Plus: the Joker in comics, TV and movie history. ARTS & ENTERTAINMENT
