I loved the first season of UTD but then I got lost about halfway through the second season and stopped watching. I will always love the book but that's true of all of King's books. There are several movies that I feel didn't do his books justice. Lately, with him as the EP, I think it helps keep his vision in tact.
As for the rest of the trilogy? I say, bring it on, with the same cast (when possible) and crew.