It's really excellent to see the Yogscast taking up one of the best GM-less games available, Microscope. I'm comfortable saying that, taken collectively, it may be one of the games which has provided the most consistent pleasure and enjoyment in the years since it's been released (seven years now, Jesus) of all the games I own – and I am literally sitting by an entire wall covered in shelves full of role-playing games.
The production values are quite tight and while the play is a little bit silly at times, overall things are kept pretty in focus. This can be a real problem for people who are new to GM-less games in general because humor and comedy are one of the first to go-to defenses for people who are a little out of their comfort zone and pushed to be creative. I've had more than a few convention sessions which got off to a rocky start because people were just not comfortable enough and ready to trust the other people at the table enough to really dive in and be serious off the bat.
It passes.
The Yogscast crew gets through basic set up of a Microscope session in this 22 minute video, and I find myself really looking forward to seeing what they do next.