I heard Kings referenced a few times, and mostly positively, so I gave it a shot and watched the first couple episodes on Hulu. I was pleasantly surprised! It's not perfect, but it's pretty darn good for a network TV show!
I'm a sucker for modern re-tellings of classic stories, and for the most part I think they're doing a good job with the King David story here. There are certainly moments and actors/characters that are a bit over the top, but it hasn't been enough to ruin it for me.
One nit to pick: Spoiler:
I just watched the second episode, and there's no way you're going to convince me that the people at the Veteran's Affairs office (including David's mother) don't recognize the princess. That was just totally unbelievable.
Unfortunately, I don't think most network TV viewers are interested in a show that's not another NCIS/CSI/Numb3rs/Criminal Minds clone, and certainly not one that involves an alternate existence where modern times are met with absolute monarchies and fictional kingdoms. The ratings seem to support this so far, and I won't be surprised if this show doesn't make it past one season.
io9 has had some decent
reviews of the show, including both praise and well-deserved criticism.