If we don't care what game mode we'd be put into, can we have a quick play link from main private lobby that will just join any in progress game or lobby within the appropriate region/skill level? I believe this would maximize possibilities for getting in a game quickly as well as fill up in progress games faster. This would include all multiplayer modes and campaign.
I like that idea and I very much hope that they add it, but from what I remember from that article about how the lobbies work, it might not be as simple as it sounds...