Joss Whedon

He revolutionized the world of TV shows with Buffy, which started off poorly but improved with each season. He created that misunderstood masterpiece that is Firefly. He gave a boost to the success of web series with Dr Horrible, a tragic comedy like few others. He conceived Cabin in the Woods, the most successful horror film (if we want to call it that) of the past two years. Avengers is a piece of crap, but we can forgive him for it.