Things I liked:
Much, much pretty.
Jack's canonical orientation.
The butterfly motif.
The lack of any overt Christian imagery or references.
The KJV style of the press releases.
How David conquered the Goliath.
Things I don't mind:
Jesse being female.
The reordering of the story for dramatic reasons.
The changing of the story for dramatic reasons.
Things that bug slightly:
Why Silas and not Saul?
The Hero being the only blond. (It's a trope I really hate - good guys always seem to be blonds in an otherwise dark cast.)
The dejudaizing of the whole thing. I get it; I don't have to like it.
Thing that made me go "HUH?"
Liszt - it's an alternate universe. It has countries named Gilboa and Gath and Oesterria (or however it's spelled.) That they speak English is something I'm glossing over - I'm figuring magical TV translating. But that our universe and their universe share a composer just doesn't work for me.