I'm going to be pretty blunt this time around: whoever's in charge of miiverse needs to go.
The system is in havoc. There've been obvious shortcomings to the implementation of an otherwise great idea, and instead of addressing those, it's all been a random reshuffling of features (read: arbitrary addition and removal of functionality) for a year now. This is not a beta phase, this is supposed to be a finished product. Clearly it should show directions of future development, and yet it should be a finished product by now. It wasn't by launch, as still isn't. We had a shorter-than-an-sms message limit for the better part of the year, followed by a 'wait, your activity log is loading..' followed by more and more of it. No age restricted communities (thinking of the children is one thing, not thinking of the adults - an entirely different thing), instead we got overzealous moderation where any prankster/prick could report your post and send it to sleep with the fishes. We got a browser portal just to have arbitrary functionality disabled when using miiverse via it (a web-based product gets disabled functionality when run on a browser, oh the irony), and the latest 'update' disables yet more useful features (this time not just in the browser portal) just because.
Bottomline being, the entire product gives the appearance of something done by 5 people in a basement. Get it together, nintendo!