These types of interviews/forums are never my favorite thing.
They serve little purpose for anyone who's not unknown. That's why "Unnamed Man" comes off so well in them, because people have seen so little of him. It doesn't benefit Sanders because he's well known enough. It doesn't help Clinton because she's the front runner.
Even if they're on the same stage, Hillary can't punch down to Sanders. There's no reason to call someone out on something when they're not there to defend themselves. This was, in some ways, a repeat of Bernie and Hillary's interviews last week. (Or the week before, I can't remember.)
I do love Rachel Maddow. I would love to see her host a Dem debate. Hell, I'd love to see any of the GOP clown car sit down with someone like that without a list of rules and questions that can be asked.