On Saturday, Legendary was back here promoting another world-in-ruins monster movie, âGodzilla.â Sneak-peek footage drew cheers (and its monstrous thumps shook much of the vast convention center). But the elaborate presentation â along with similar ones made by studios like Sony and 20th Century Fox â also raised a question that has been lingering in movie theaters all summer: Does serving up more of the same still deliver the same punch?  Comic-Con, a pop culture convention that drew roughly 140,000 fans to this breezy city over the last four days, has for years been seen as a read of the mass marketplace, even as many here seemed to be more interested in the conventionâs less mainstream offerings. What entertainment genres are on the rise? Which new movies are in trouble?  There were certainly some surprises. The 6,500 people who packed the San Diego Convention Centerâs cavernous Hall H on Saturday, for instance, reacted with euphoria for âGravity,â a science-fiction thriller starring Sandra Bullock and George Clooney as astronauts adrift in space. To simulate weightlessness, Warner Brothers mounted cameras on specially developed robotic arms.  âTotally original and different,â Ms. Bullock said, as fans nodded in agreement.  But âGravityâ was one of the few films pushing originality claims that seemed to actually deliver. Indeed, throughout Comic-Con, there was a sameness to the films, both to one another and to movies like âPacific Rimâ that have come before and failed.  The studio presentations for âDivergentâ and âThe Mortal Instruments: City of Bonesâ were virtually interchangeable, with a female novelist and a young Everywoman star talking about bravery while flanked by a phalanx of young hunks sporting varying degrees of sensitivity and Commonwealth accents.  Change the names and faces, and they might have been selling âThe Hunger Games: Catching Fire.â Jennifer Lawrence, who stars in that dystopian series, appeared in Hall H twice on Saturday, returning for âX-Men: Days of Future Past,â the seventh installment of that superhero franchise, scheduled for 2014.  Studios also showcased another âAmazing Spider-Man,â another âCloudy With a Chance of Meatballs,â another âAvengers,â another âThorâ and another âCaptain America.â Warner at least spiced up its announcement of another âMan of Steelâ by adding a new co-star: Batman.  In addition to âGodzilla,â remakes teased here in recent days included âRoboCop,â coming in February from Sony, and âRiddick,â a Universal Pictures continuation of Vin Dieselâs âChronicles of Riddickâ franchise.  Even many of the original movies introduced at Comic-Con this year had a been-there-done-that feeling to them, notably Legendaryâs sword-and-sorcery picture âSeventh Son,â which co-stars Jeff Bridges, Julianne Moore and Ben Barnes. In thundering snippets of footage shown on Saturday, the movie at times resembled âClash of the Titans,â âSnow White and the Huntsmanâ and âThe Chronicles of Narnia: Prince Caspian,â which also starred Mr. Barnes.  Some of these films â however derivative of what has come before â will undoubtedly become global hits, showering studios and the media conglomerates that own them with profits. The first âAvengersâ took in more than $1.5 billion at the box office and generated hundreds of millions in DVD and toy revenue.  Indeed, the potential returns are promising enough that several studio moguls personally came to Comic-Con to assess the fan reaction: Jim Gianopulos, Foxâs film chairman, turned up in dark 3-D glasses, while Kevin Tsujihara, Warnerâs new chief executive, tried to blend in by wearing an untucked button-down shirt. Rob Friedman, co-chairman of Lionsgateâs motion picture group and in the running for the presidency of the Academy of Motion Picture Arts and Sciences in its election on July 30, mixed with the fans at his Summit labelâs Thursday presentation.  But even as studios came to the bubble of Comic-Con to unveil their megamovies â all will have budgets of $100 million or more, and sometimes much more â real-world ticket buyers were showing increasing fatigue with the same old, same old.  âPacific Rim,â which cost Legendary and Warner at least $180 million to make and about $150 million to market globally, has taken in about $178.5 million, roughly half of which goes to theater owners. But it is not alone: six big-budget movies have crash-landed since May 1, including âWhite House Down,â âThe Lone Rangerâ and â over the weekend â âTurboâ and âR.I.P.D.,â which cost Universal Pictures $130 million to make and took in about $12.8 million.  âR.I.P.D.â also starred Mr. Bridges, who made no mention of its failure on Saturday in Hall H. But the actor did work hard to make âSeventh Sonâ sound intriguing, telling attendees that the film, set for release in January, is âchock-full oâ myths and magic and all kinds of things like that.â He even threw in a quote from the Russian novelist Aleksandr Solzhenitsyn.  But Mr. Bridgesâs assurances did not quite seem to convince the crowd, whose response to the âSeventh Sonâ panel was more polite than thrilled. (Legendaryâs chief executive, Thomas Tull, declined an interview request.)  The people who swarm Comic-Con generally have an insatiable appetite for films in the superhero, fantasy, science-fiction and animation genres. At a couple of moments over the weekend, however, even attendees seemed to be growing frustrated with the sameness of the films Hollywood is giving them.  At one point during a question-and-answer session for âThe Lego Movie,â a coming animated picture, a young boy came to the microphone and pressed panelists to say what in the film had ânever been done before.â  Asked what he would hope to see, the boy, about 10 years old, said, âa little bit of CG, but not too much,â referring to computer graphics. The crowd cheered.  âYouâre going to love the movie,â one of the filmâs directors, Phil Lord, promised. âThis is the weirdest kidsâ film, Iâm pretty sure, that has ever been committed to celluloid,â he added.  The boy flatly responded, âI hope so,â and turned heel.
Many of the movies offered to fans in San Diego were sequels or retreads, raising questions on whether âmore of the sameâ was about all Hollywood had.