There's nothing to really get. It's basically a circle jerk for Nintendo fanboys and people who like to draw photos. It frequently gives me nightmares of the horrific old Nintendo forums which used to have threads like "y can't polygons be round?"
But some people like circle jerks and drawing doodles with limited tool sets. If you're one of those people, you'll "get it." It cannot be compared to neoGAF since this place can actually sustain healthy discussions
But 3DS Miiverse is basically also unusable too it's so damned slow, so that could be compounding the issue for you.
There is so much wrong in this post dude. It sounds like you had one look at Miiverse and that's it.
I already said this in an earlier post, but I've seen so many posts that are negative, either towards a game, the Wii U or Nintendo itself. I've seen conspiracy theories about how Nintendo is censoring the Wii U Browser because they had issues watching some youtube videos about the PS4 (which is ridiculous). And only the posts where people were flat out insulting eachother got deleated. There's a much more diverse range of opinion than you give it credit for.
I've had my fair share of healthy discussions with people (particularly in the Zombi U and Super Metroid communities) both on my own posts and on other peoples. Did you ever make a post on Miiverse that was more than just "I like this game" or "I hate this game"? I think you'll find that you can easily have intelligent conversation with people if you post more interesting stuff. Sure there'll be some fanboys posting crap, but thats hardly surprising.
Ofcourse opinions are going to be more positive than negative about Nintendo. It's a Nintendo Social Network that's exclusive to Nintendo systems. The fact that you and some other posters are shocked or even annoyed by this is hilarious.
And I like how you ignore so many benefits of Miiverse and just say it's a circle-jerk for Nintendo fanboys.
It's the best way to find out how good/bad a game is from people who have actually played it. It's great for devs to interact with their audience (The Bit Trip guys did some awesome stuff on Miiverse) and yes, sharing screenshots and Miiverse drawings really is great.
Now I'll grant you that there are fanboys and kids posting crap on Miiverse, but to generalise the entirety of Miiverse as simply being a fanboy circle-jerk is both wrong and ignorant. Besides you'll find the same crap on any forum, yes even Neogaf on occasion.