Dude, if you think people haven't heard of Knights of the Old Republic, you've been living either in the boonies or under a rock. My classmates, roommate, and even my neighbor's grandmother wouldn't shut the hell up about that game when it was launched. Okay, maybe not the grandma, but I'm making a point, dammit!
Anyway... On to the original topic.
Earthbound (before a bunch of reviewers re-discovered it at some point), Einhander, and the Souther Park video game for the N64. That, and Twisted Metal 3, though I don't know if that's so much 'unheard of' as much as it is 'world's most limited following'.