I briefly considered joining the Nintendo.com forums once, but the avatars were all really small, you had to post in only the "Game Help" section for three days, or something, and the whole thing just had this childish air about it (does that place even exist anymore? I heard there was this whole profile exodus prior to the site's makeover).
On a somewhat related note, my friend, when he was tired of the Nintendo.com forums , decided against just not going there anymore and instead did Snakes on a Plane spam until he got banned.
Also, I've considered the 1up forums, but I dunno...