It's just a series of fanvids based on the original ACD canon. They're a lot more expensive to produce that most vids, a lot longer, and a lot more popular, but every Sherlock episode is still basically fanwork and are no more "legitimate" than "Alone on the Water." The BBC needs us a lot more than we need them. Without their show, we'd just find another one and our lives really wouldn't change that much. Without us fans, the show would be cancelled and everyone involved would need new work. So screw anyone who says fans and fanwork aren't important. Screw them right into termite-infested wood.