I like it. Interesting start.
i picked up on the Saul/David/Goliath thing early. there are a lot of subtle and not-so-subtle allusions to the story in the Bible. Loads of it, which is interesting because the story of David is a truly awesome story.
Of course not everything is the same as the original. In the real story, the evil king's son is named Jonathan, and he is a hero that makes David his brother. Jonathan didn't even want to be king--he was true to the Lord.
I figure they needed another villain to change things up a bit. but yeah--cool show.