The prevailing zeitgeist regarding Sleepy Hollow seems to be that it is a show that has succeeded despite itself. I firmly agree with that. The idea is sophomoric -- What if the Headless Horseman from Washington Irving's story was actually one of the Four Horsemen of the Apocalypse? And what if he and Ichabod Crane traveled forward in time to the present? And what if the person who defeated him then was George Washington?
In spite of the ludicrous plot, the show is pretty good, especially for serial network television. The show knows that its fundamentally ridiculous, and gives the audience plenty of knowing winks, which allows us the freedom to buy into it and just go along with it. The acting is good, with serious charisma between the show's two leads, and the mysterious monster-of-the-week format is lovingly stolen from shows like The Twilight Zone and The X-Files.
I have my doubts about the energy being sustainable for several seasons, but at least for now, I'm having a lot of fun with it.