I would watch one as good as the linked video, but not as a substitute for reading the book; rather, I'd watch it after I'd read the book. I would think it works especially well with first person stories such as "King of Thorns." The only real problem I encountered had to do with the actor's "accent." As an American (forgive me!), I had a bit of a problem catching in its entirety what he was saying. Quite faux-Shakespearean though.
No video or audio books for me. I actually enjoy the reading part--having the book be from my perspective. However, it would be interesting to see it from the author's perspective. Like Simon--I think it would be a possibility after having read the book.