I'm not a fan of endless mystery in storytelling - I like to know where the mythology's going; I like to get there in an exciting, fast-paced way - enough that there's a really clear, aggressive direction to where it's going, to pay off mystery and reward the audiences loyalty.
Eric KripkeLet's be honest, any show will live or die based on how good the characters are, how good the actors are, how complicated the relationships are, how grounded they are and how much heart they have.
Eric Kripke