Let me just tag onto this: I've seen examples of how both of them DM and they do a great job. I just don't get the notion that somehow the fact that they're actors makes what they do unapproachable. I mean acting is something you can both be talented at and a skill you can learn. BUT, it amazes me that somehow they won't have something to teach about running a game. Talking about improv, for instance, is a skill anyone can learn, and will make you a better DM.
I have a couple of friends who are actors and they'd laugh out loud if you told them they had some special skills that only people like them could do. Watch some of Ann or Matt's videos and you'll get an idea of how they do things. And I suspect you'll get some things about how you can be a better DM. Or you might see some things to cement what you would never do as a DM.