I'll start by saying it is an interesting idea and concept. I can see some potential in this, and I am curious to see the story unfold. I hope you do not take this personally, but if I am being honest, it is not quite working for me yet. I will likely watch another episode, though, to give it a chance.
On the plus side, there are a some entertaining moments and some fun exchanges between players. It is also neat to see the actors adjust to things being said like in the "blazing - lazing" scene or change their demeanor after a dice roll.
On the downside, I am also a little put off listening to some of the voices coming out of mismatched characters. The Blagdor character, for example, is especially troublesome. Hearing Kelsey's voice come out of that actor's body is not working well for me. Maybe this was done intentionally for some comedic effect? I don't know, it just seems to annoy me. I think the biggest issue to overcome, however, is that the game action moves too slow for the actors. There are some awkward moments when characters are standing around with nothing to do or they are waiting for some particular dialogue. I think this is partly why the DM's issues are noticeable. If I am sitting around the table listening to him, it is a non issue, but listening to him when the character actors are on screen is a different feel. Things in general are just moving too slowly for the role play actors. Obviously, the D&D game has just started. The premise of the adventure needs to develop a little further, so maybe this will change as the game continues. I worry that the pace of the game play is going to be difficult to keep me hooked as a viewer
Sorry, I do not mean to be a downer. I am just relaying my impressions after watching the first episode. As I said earlier, it is an interesting endeavor, and it has peaked my interest enough to at least watch another episode, so that says something.
ETA...I showed my son the trailer as he has gotten into to D&D over the past few months. He is interested in the concept as well and is looking forward to watching it.