It’s a noisy, universe-rattling spectacle full of sound and fury with a suitably epic design, solid digital effects and a healthy respect for the comic-book lore. The arrogant warrior Thor’s great conversion, central to the plot, is unrealistically lightning-quick and the movie’s dramatic arc falters amid the constant shifts between earthly and celestial realms. But execs at Marvel Studios, gambling heavily on the success of “Thor” and the upcoming “Captain America: The First Avenger” to set up next summer’s ensemble behemoth “The Avengers,” can rest easy: You’ve built it and they will come. They may even bring a date. “Thor,” which world-premiered in Sydney on Sunday, opens in various foreign markets ahead of its North American bow on May 6 through Paramount.