I've found myself leaving my gamepad docked next to my desktop when I'm doing work just to watch WaraWara plaza, I guess it's likely the moderation that makes everything so pleasant :D some people draw some crazy ass things!
I've posted a few things for games like ZombiU where I've got stuck, tagged a spoiler and not really expected a reply - but people have replied pretty quick to things (really hope this keeps up, having the ability to screenshot and post a message for something like that is awesome).
Aside from loading speeds of generally everything on the system, it's got me pretty excited for things in the future for the Wii U. I think notifications could do with some improvements, friends list things too (messages etc.).
How has everyone's experience been with Miiverse so far? anyone else leaving WaraWara plaza running in the background while they do stuff? or am I just crazy x_X