Twisted Pictures/Kobal/ShutterstockThe 2000s were an amazing time to be a lover of weird musicals. It was the era of A Very Potter Musical before Darren Criss defected to Glee, and the era of Dr. Horrible’s Sing-Along Blog. But more than anything, it was the era of Repo. Repo! The Genetic Opera is the kind of movie that shouldn’t have happened, a gothic, over-the-top dystopian musical that managed to star actors from Buffy the Vampire Slayer, Go…