When ever I think of BL main adventure mode, I always incorporate actual BL themes in to it.
Like say, the way in that one StarWars Blockland thing, Darthvador is choking the one guy out and the guy says "This is a clan server, we are password protected!" Darth: "Then where are the clan tags!"
That explanation sound a bit sketchy, but what I'm trying to say is: Crazy original classic storylines of evil sweeping the land and "up to you" to save us just sounds so... "Blagh."
I've always liked the sillyness of Main Adventure mode discussions.