If anyone's worried about what games should qualify for such a forum, you could just make it easier on yourselves and let me choose all of them.
But seriously, I imagine that such a process would involve a forum-wide majority vote, which in turn could be vetoed by the administration if deemed inappropriate. However, a great starting point would be a forum for OWI/Lorne Lanning discussion, a forum for DoubleFine/Tim Schafer discussion, maybe a forum for whoever made "Fallout" (I'm trusting you guys on this one; I've personally never played it), and maybe a separate forum for, say, unique Japanese games with superior artistic direction, like "Shadow of the Colossus" and "Katamari."
Tenets for any games to be considered must include: unique gameplay, unparalleled art direction, and a general sense of "breaking the mold" in the gaming industry. And perhaps the game wasn't as well recognized as it should have been, "sleeper hit" or "cult classic" if you will. Unfortunately, I wouldn't consider games like The Elder Scrolls in this category, simply because they were so acclaimed and not nearly quirky as the OW and Psychonauts games.
As for a name... I don't know. "Cult Classic Gaming: A forum for the discerning gamer." Or something. I'm not good with names. XP