1) IT'S NOT A COMEDY! Yeah, there's humor in it, but in the way a Buffy, Angel, or a Torchwood uses it.
2) They recasted two of the main characters from the pilot & changed away from the "darker" tone. The female is acting too much like the original, which is BAD. The changed lead male NEEDS to act more like the original. Let's also not forget the BBC only ordered six episodes. Oh yeah, did I mention that they decided the look was too dark & gothic, so they changed the sets & upped the lighting. However, they kept the same "tone" in the story.
P.S. This also has ALREADY premiered. Their SECOND ep (after the pilot) is Feb. 1.