Honestly, I do think that NeoGAF is one of the better video game forums out there, given that registration is strictly restricted to school, work, and ISP email addresses[0]. But even so, you still have wade through many unproductive one-liners to find a post of modicum importance. And as far as I have heard, NeoGAF is frequently visited by game journalists and developers alike, so the bar is already pretty high.
Some people have tried making more mature gaming communities, such as the owner of Insomnia who enforces a very strict posting guideline[1] and requires a paid subscription in order to participate[2], but I feel that these types of communities are often too restrictive in the types of content they can provide, often limiting themselves to specific discussions on higher level game mechanics of specific genres, and, as a result, lack the diversity found in forums like NeoGAF.
[0]http://www.neogaf.com/forum/showthread.php?t=390708
[1]http://insomnia.ac/commentary/posting_guidelines/
[2]http://culture.vg/subscribe.html
