The long-awaited premiere of Warner Bros. Pictures’ live-action superhero team-up film Justice League was anything but super, and the underachieving film paired its poor early reviews with an even more underwhelming opening weekend at the box office.The $96 million debut for Justice League in U.S. theaters is the lowest of any film in WB’s cinematic universe based on DC Comics characters, and well below the early projections that had it raking in at least $120 million from Thursday’s “preview” screenings and the three-day weekend. Given that the film was intended to be WB’s equivalent to The Avengers, uniting all of the studio’s primary superhero characters on the same screen for a joint adventure, its debut was particularly bad and will likely lead to some hard questions about future projects that were announced but had yet to begin production.For reference, The Avengers currently holds the record for the biggest opening weekend of all time for a superhero movie with its $207.4 million debut in 2012. Marvel Studios’ next team-up film, 2015’s Avengers: Age of Ultron, has the second-biggest opening weekend of all time for superhero movies with $191.2 million. #Title Weekend U.S. Total Worldwide Total 1.Justice League$96M$96M$281.5M2.Wonder$27M$27M$27M3.Thor: Ragnarok$21.7M$247.3M$738M4.Daddy’s Home 2$14.8M$50.5M$51M5.Murder on the Orient Express$13.8M$51.7M$148.2M6.The Star$10M$10M$10M7.A Bad Moms Christmas$6.8M$50.9M$77.5M8.Lady Bird$2.5M$4.7M$4.7M9.Three Billboards…